Events will not be passed to forms / containers / controls that are not visible.
Controls no longer perform useless "am I enabled?" check when handling events.
Fixes the test app so that the virtual gamepad is disabled when not in use.
Merge branch 'next' of https://github.com/blackberry/GamePlay into next
Also fixing a memory leak in Gamepad.cpp.

Conflicts:
	gameplay-tests/src/TestsGame.cpp
Merge pull request #720 from ablake/next

UI changes and a memory leak.