Button Upgrade to use Text Visual

Button Upgrade to use Text Visual

Fixing Autorepeat logic and Label Property setting with Keys.
Fix SetSelected bug when not OnStage and Removing cyclic relayout bug
Setting SetSelected to true before control staged would not remove old visuals before showing selected visuals, fixed.
Relayout was calling a function which itself called RelayoutRequest
Text visual properties now merge, RegisterVisual sets enable
Using SetTransformAndSize API instead of SetProperty
fixing stylesheets
GetLabelText property fix
Common code to get Visual Property Maps
Fixed test case that was using TextLabel Property instead of TextVisual
Adding Text Visual enum to string entry
Fixing Incorrect application of text padding

Change-Id: I732361023d9c843badb6d0be3122b055ac40c6c4