Added overflow padding in the Multiplayer screen, and adjusting content (LoungeSubScreen, FilterControl, Header, "Create Room" button) to account for this padding.
Implements IHasAccentColour for conformity to rest of project. Also fixes a nullref when opening the login menu.
This also - Renames TextAwesome to SpriteIcon. - Removes the default size of "20" from SpriteIcon (now defaults to the underlying texture size).
Will likely need to be bindable when hooked up to settings and actually used.
Depends on https://github.com/ppy/osu-framework/pull/837