Quiet Hours: Clean up and consolidate code

- Added: Allow disabling of system sounds

Ported from cm-10.2.

Change-Id: I7d2619becb99c336d23896a672136f491d972abd
Fix "no recent apps" color

RIP #33b5e5

Change-Id: Iae5948e224d06023962e43f905756017b42f0637
"Clear all" button on recent apps

Port forward from cm-10.2

Change-Id: I9ebcf22f85957f61caefb14e0efd4cf2978d92cd
Add xxhdpi versions of our improved tethering icons

Change-Id: If943f81389774a1f8ca0407cab4756687a273be7
Merge "Add xxhdpi versions of our improved tethering icons" into cm-11.0
hwui: Apply hwui qcom fixes to all adreno-bearing hardware

Even if the device doesn't fully use the qcom stack, changes to
libhwui are generally workarounds for adreno-specific issues and
apply across the board without other dependencies

Change-Id: I10455ebf09c1d00762b06e3c092398604bb39796
Hide new non-standard permission

These were breaking builds due to the public API modification

Change-Id: I603fcf0601f40fb315086859aa03ef5b7ec39248
Merge "Fix "no recent apps" color" into cm-11.0
Port Forward Quick Unlock

PS3: Fix whitespace and author.

Change-Id: Ic64c47bb35ee4da13b0332d853725a6ef60ac8d4
Merge "Port Forward Quick Unlock" into cm-11.0
Merge "Quiet Hours: Clean up and consolidate code" into cm-11.0
Merge remote-tracking branch 'cm/cm-11.0' into HEAD