[Misc] Removed Angular
[Todo] Fixed checkmarks
[Input] Key mapper observes modifiers
[Misc] Removed focus outline
[Menus] Moved electric rectangle to SpecialEffects
[Menus] Started adding a "back" menu button, but it's too ugly to release yet
[Menus] Added a "Test Graphics" menu
[Menus] Temporarily disabled "Game Options" menu
[Menus] Temporarily disabled Start menu
[Bombs] Releasing a bomb cancels the player's velocity