SystemUI: A proposal for a new quiet hours icons

 PS2 added xxhdpi icons
 PS3 removed xxhdpi icons
Change-Id: I87e660210e2089d1bb09da47d39695bbda2889af
Fix certain setting writes being incorrectly skipped.

If a value that previously had a very long value (over the 500 char
threshold) is now set to null, isRedundantSetValue would incorrectly
return true even though the value was changed.

Change-Id: Ia5304743024ec01024be98aa51ed260d38caf93c
Merge " SystemUI: A proposal for a new quiet hours icons" into cm-10.2
Merge "Fix certain setting writes being incorrectly skipped." into cm-10.2
Revert "Delay hiding systemui by 100ms"

This reverts commit af780e0f304a9bb20fd7ef12ac53aa4dce6f7b73.

This seems to make some problems.
e.g.: Sometimes NavBar buttons will stay visible on Lockscreen...
merge changes from CyanogenMod 10.2 into local branch