QuickBoot: enable QuickBoot Settings UI

Add QuickBoot enable item in DevelopmentSettings.

Change-Id: Id2aaec4ad3e85f51235db4c25d49136a26502e20

Conflicts:
	res/xml/development_prefs.xml
	src/com/android/settings/DevelopmentSettings.java
Settings: apple can do...we can do as well

incredible apple engineers speeded up the overall UI and reduced per default slightly
the animation scales. Well we do as well and reduce it from 1 to 0.75...smooth, looks well
and does not break anything

Change-Id: Ifab9c0111429389d715319e4f272a8298c4dba80