Add forceHighEndGfx property to override isHighEndGfx

Thanks to CyanogenMod, port from their performance settings

Change-Id: I98cabf1a5f161f93fe08b8f32299f6e01b9ec48d
DU Download Center [WIP]

Change-Id: Ibd82a1309ab70d4686f90d7c8c3c357011bf00f8
Enable/Disable NavBar [2/2]

Credits/Thanks to AOKP

- Fix height/width

Change-Id: I155d1c00f9904611bb14d0ed4058fc8b39a492e3
Merge "Add forceHighEndGfx property to override isHighEndGfx" into du44
Merge "DU Download Center [WIP]" into du44
Merge "Enable/Disable NavBar [2/2]" into du44
Merge branch 'du44' of https://github.com/DirtyUnicorns-KitKat/packages_apps_Settings into HEAD

Conflicts:
	res/layout/preference_navbar_enable.xml
	res/xml/dirtytweaks.xml
	src/com/android/settings/du/DirtyTweaks.java