Theme system ideas

[MathMan05]

While it's been in the plans for a while, a true theme system has yet to be implemented, so here's a discussion for ideas on a theme system for Fermi. Right now a lot of these are plans for plans so this is to form that.
Right now here's what I have in mind:

• The theme system will be separate from the extention system, though I do plan to let extensions have themes if they so want to.
• The theme system will be able to have CSS included for themes, along with this they may define CSS variables the user can set to interact with the theme and customize it, along with the menus it should include
• Icons can be bundled
• This will be its own file format, but you do not need to worry about this yourself, this is just an implementation detail