WebOS: Change to multitouch control scheme.

This is a near-rewrite of the WebOS event system to take
advantage of multitouch, with which all WebOS devices are
outfitted. This commit also marks full compatibility with the
HP TouchPad, or any future tablet device without a hardware
keyboard.

Controls:
 - Left click: Single-tap once
 - Right click: Put one finger on screen, single-tap another
 - Middle click: Put two fingers on screen, single-tap another
 - Menu: Swipe two fingers down
 - Show keyboard: Swipe two fingers up
 - Touchpad Mode:
   - Swipe two fingers to the right to toggle
   - When off (default) mouse will move to the location tapped
   - When on, mouse will move relative to its current position
 - Autodrag Mode:
   - Swipe three fingers to the right to toggle
   - When on (default), touching the screen and holding still
     for a half-second will initiate a left-mouse button hold.
	 Useful for games like COMI and FT.
   - When off (or on) a double-tap will initiate a left-mouse
     button hold.
 - Escape key: Swipe two fingers left
 - Space bar (pause): Swipe three fingers down

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