Add support for chat formatting (bold, italic, underline, etc)

[Skylandia]

Needs more testing.

[milutinke]

Have you tested this?
Can you provide some screenshots of how it works?

[Skylandia]

demo screenshot


Featuring italics, strikethrough, and bold.

Still WIP, since the italics aren't properly applied in the screenshot.
(the link should be italicized as well)

[Skylandia]

Should be in a mergable state if nobody has any issues.

edit: just kidding this is not mergable there are still issues