Adds touch events to the array of "basic" events in SC.RootResponder. This removes the need for two separate array instances and touch is a basic event.
Starts run loops for SC.ScrollView touch drag and deceleration handling. Deceleration uses requestAnimationFrame to do calculations (outside the run loop), but the display update isn't raw so we need to start a run loop for the display to properly update.
Fixes a regression in SC.ScrollView that threw an exception when beginning a new touch drag while a previous one was still decelerating.
Improve the performance of the small list in the Welcome app by turning off incremental rendering.