ExpertPlus is for beatmaps above 6.75*
Used to get correct bindings for a mode (ActionMappingInputManager).
Also fixes circular references when using IJsonSerializable.
This also - Renames TextAwesome to SpriteIcon. - Removes the default size of "20" from SpriteIcon (now defaults to the underlying texture size).
Improves performance substantially.
FirstOrDefault when called on a TableQuery with a predicate doesn't use table indices
Now can locate any osu-stable installation using registry lookup (with ample fallbacks). Also uses a much more controlled access method via StableStorage.