Add a quick and dirty sensitivity slider.  This needs a bit of work
still.
Encapsulate bindings to ensure single access point.
Fix issue with game grabbing mouse cursor from outside game.
missed from last checkin
Fix bug where movement gets locked in after transitioning from game to
gui
Add JoypadMouseHelper to handle mouse grabbing issues.
remove calls to mc.inGameHasFocus except for one in attack
remove "fml.noGrab" calls
Update game/gui controls to mirror xbox/1.6.2 joypad version.