build(): build a -rtl.css file along the css, and compile _every_ sass files

[hansl]

It's simpler.

[jelbourn]

Would it be better to make a standalone broccoli-cssjanus plugin (similar to how autoprefixer is implemented)?

[hansl]

This will not make it in, as we decided that using RTL specific handmade CSS was better (for the time being). We can always revive this PR when needed.

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