Reduce dependencies

[mbollmann]

Originally reported by: Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann)

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CorA has a lot of dependencies right now if you want to build everything.

In particular, a lot of different language interpreters are required: you need PHP (of course), Ruby (for Sass), Python (for mkdocs), Perl (for NaturalDocs), Java (for the minifiers), ...

Could we try to cut back on this a bit? Sass wrappers are available for many different languages, so maybe we could use a PHP- or Java-based solution here. Maybe documentation could be changed to use fewer different systems (e.g. a common system for PHP+JS docs maybe?).

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• Bitbucket: https://bitbucket.org/mbollmann/cora/issue/26