按钮触摸状态

除了按钮，触摸控制器能探测是否用户手指是触摸一些按钮或在某一特定位置。

这个状态用位被报告在触摸域，还能被检查通过一个下面的常量：

ovrTouch_A	User in touching A button on the right controller.
ovrTouch_B	User in touching B button on the right controller.
ovrTouch_RThumb	User has a finder on the thumb stick of the right controller.
ovrTouch_RIndexTrigger	User in touching the index finger trigger on the right controller.
ovrTouch_X	User in touching X button on the left controller.
ovrTouch_Y	User in touching Y button on the left controller.
ovrTouch_LThumb	User has a finder on the thumb stick of the left controller.
ovrTouch_LIndexTrigger	User in touching the index finger trigger on the left controller.
ovrTouch_RIndexPointing	Users right index finger is pointing forward past the trigger.
ovrTouch_RThumbUp	Users right thumb is up and away from buttons on the controller, a gesture that can be interpreted as right thumbs up.
ovrTouch_LIndexPointing	Users left index finger is pointing forward past the trigger.
ovrTouch_LThumbUp	Users left thumb is up and away from buttons on the controller, a gesture that can be interpreted as left thumbs up.