Classify excluded code

[JoeRobich]

Resolves #3788

Requires a color to be specified for the "support.other.excluded" scope. Recommend using the following tweaks:

VS2019 theme tweaks:

    "editor.tokenColorCustomizations": {
        "[Default Dark+]": {
            "textMateRules": [
                {
                    "scope": "support.other.excluded",
                    "settings": {
                        "foreground": "#808080"
                    }
                },
                {
                    "scope": "keyword.preprocessor",
                    "settings": {
                        "foreground": "#808080"
                    }
                },
                {
                    "scope": "punctuation",
                    "settings": {
                        "foreground": "#D4D4D4"
                    }
                },
                {
                    "scope": "entity.name.namespace",
                    "settings": {
                        "foreground": "#D4D4D4"
                    }
                },
                {
                    "scope": "entity.name.variable.field",
                    "settings": {
                        "foreground": "#D4D4D4"
                    }
                },
                {
                    "scope": "variable.other.property",
                    "settings": {
                        "foreground": "#D4D4D4"
                    }
                },
                {
                    "scope": "variable.other.constant",
                    "settings": {
                        "foreground": "#D4D4D4",
                    }
                },
                {
                    "scope": "variable.other.enummember",
                    "settings": {
                        "foreground": "#D4D4D4"
                    }
                },
                {
                    "scope": "entity.name.type.interface",
                    "settings": {
                        "foreground": "#b8d7a3"
                    }
                },
                {
                    "scope": "entity.name.type.enum",
                    "settings": {
                        "foreground": "#b8d7a3"
                    }
                },
                {
                    "scope": "entity.name.type.parameter",
                    "settings": {
                        "foreground": "#b8d7a3"
                    }
                },
                {
                    "scope": "entity.name.type.struct",
                    "settings": {
                        "foreground": "#86C691",
                    }
                },
                {
                    "scope": "entity.name.function.extension",
                    "settings": {
                        "foreground": "#DCDCAA",
                    }
                },
                {
                    "scope": "comment.documentation",
                    "settings": {
                        "foreground": "#608B4E",
                    }
                },
                {
                    "scope": "comment.documentation.attribute",
                    "settings": {
                        "foreground": "#C8C8C8",
                    }
                },
                {
                    "scope": "comment.documentation.cdata",
                    "settings": {
                        "foreground": "#E9D585",
                    }
                },
                {
                    "scope": "comment.documentation.delimiter",
                    "settings": {
                        "foreground": "#808080",
                    }
                },
                {
                    "scope": "comment.documentation.name",
                    "settings": {
                        "foreground": "#569CD6",
                    }
                },
                {
                    "scope": "comment.regex",
                    "settings": {
                        "foreground": "#57A64A",
                    }
                },
                {
                    "scope": "constant.character.character-class.regexp",
                    "settings": {
                        "foreground": "#2EABFE",
                    }
                },
                {
                    "scope": "keyword.control.anchor.regexp",
                    "settings": {
                        "foreground": "#F979AE",
                    }
                },
                {
                    "scope": "keyword.operator.quantifier.regexp",
                    "settings": {
                        "foreground": "#F979AE",
                    }
                },
                {
                    "scope": "punctuation.definition.group.regexp",
                    "settings": {
                        "foreground": "#05C3BA",
                    }
                },
                {
                    "scope": "keyword.operator.or.regexp",
                    "settings": {
                        "foreground": "#05C3BA",
                    }
                },
                {
                    "scope": "string.regexp",
                    "settings": {
                        "foreground": "#D69D85",
                    }
                },
                {
                    "scope": "constant.character.escape.regexp",
                    "settings": {
                        "foreground": "#D69D85",
                    }
                },
                {
                    "scope": "constant.other.escape.regexp",
                    "settings": {
                        "foreground": "#FFD68F",
                    }
                },
            ]
        },
        "[Default Light+]": {
            "textMateRules": [
                {
                    "scope": "support.other.excluded",
                    "settings": {
                        "foreground": "#808080"
                    }
                },
                {
                    "scope": "keyword.preprocessor",
                    "settings": {
                        "foreground": "#808080"
                    }
                },
                {
                    "scope": "punctuation",
                    "settings": {
                        "foreground": "#222222"
                    }
                },
                {
                    "scope": "entity.name.namespace",
                    "settings": {
                        "foreground": "#222222"
                    }
                },
                {
                    "scope": "entity.name.variable.field",
                    "settings": {
                        "foreground": "#222222"
                    }
                },
                {
                    "scope": "variable.other.property",
                    "settings": {
                        "foreground": "#222222"
                    }
                },
                {
                    "scope": "variable.other.constant",
                    "settings": {
                        "foreground": "#222222",
                    }
                },
                {
                    "scope": "variable.other.enummember",
                    "settings": {
                        "foreground": "#222222"
                    }
                },
                {
                    "scope": "entity.name.type.interface",
                    "settings": {
                        "foreground": "#267f99"
                    }
                },
                {
                    "scope": "entity.name.type.enum",
                    "settings": {
                        "foreground": "#267f99"
                    }
                },
                {
                    "scope": "entity.name.type.parameter",
                    "settings": {
                        "foreground": "#267f99"
                    }
                },
                {
                    "scope": "entity.name.type.struct",
                    "settings": {
                        "foreground": "#267f99",
                    }
                },
                {
                    "scope": "entity.name.function.extension",
                    "settings": {
                        "foreground": "#795E26",
                    }
                },
                {
                    "scope": "comment.documentation",
                    "settings": {
                        "foreground": "#008000",
                    }
                },
                {
                    "scope": "comment.documentation.attribute",
                    "settings": {
                        "foreground": "#282828",
                    }
                },
                {
                    "scope": "comment.documentation.cdata",
                    "settings": {
                        "foreground": "#808080",
                    }
                },
                {
                    "scope": "comment.documentation.delimiter",
                    "settings": {
                        "foreground": "#808080",
                    }
                },
                {
                    "scope": "comment.documentation.name",
                    "settings": {
                        "foreground": "#808080",
                    }
                }
            ]
        }
    },

[codecov]

Codecov Report

Merging #3789 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3789   +/-   ##
=======================================
  Coverage   86.92%   86.92%           
=======================================
  Files          59       59           
  Lines        1805     1805           
  Branches      208      208           
=======================================
  Hits         1569     1569           
  Misses        181      181           
  Partials       55       55           

Flag	Coverage Δ
#integration	100.00% <ø> (ø)
#unit	86.92% <ø> (ø)

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