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Closes issues that Sebas closed because it was technically infeasible #745

Short description

Admin styling how awesome

Steps to use this feature

1. Use the admin

This code still requires a lot of cleaning, the !important is terrible and not always required. And the selectors of the css can be better. But the idea is almost finished.

Also, a lot of improvements can still take place.

Note that TinyMCE should use its own dark theme, which is not yet set here.