Support JSX/TSX class-name with dot

[RexSkz]

Support class names like <Tree.TreeNode.Item>.

[RunDevelopment]

I really like this change but I also think that we should include a punctuation pattern for the dots.

[RexSkz]

It's easy to add punctuation inside, but both VSCode and GitHub treats dot as a normal character in JSX tag, and there's no other special characters in it, so I think it's not necessary to recognize dot here.

[RunDevelopment]

Well, it is as you said, it's easy to add later on.

[RunDevelopment]

Thank you for contributing!