Input and game controllers

Related issues
	Bug #778: Gamepad usability issues
	Bug #1091: No sound effect played when pressing F7 or F8
	Bug #1709: Infine events interfere with taskbar
	Bug #1828: Tutorial doesn't claim mouse after clicking during launch
	Bug #1880: Key repeat rate is dependent on the user's configuration at OS level
	Bug #1915: Click-to-focus also handled as UI click
	Bug #1981: Alerts can be opened in Busy mode, causing occasional visual artifacts
	Bug #1999: Window focus/close events ignored during busy mode (should defer)
	Bug #2265: [Windows] Improved fullscreen Alt-Tab / focus lost behavior
	Bug #2463: Game controllers
	Feature #1217: Controls for all supported games adjusted at the same time
	Feature #1449: Setup bindings/controls via taskbar UI
	Feature #1541: Joystick axis settings (sensitivity, max speed)
	Feature #1571: On screen notification for Always Run
	Feature #2184: Keyboard navigation: bindable controls

Doomsday Engine