Frameworks: QS performance profiles tile

Patchset 2: Fix not null comparation
Patchset 3: xxhdpi drawables
Patchset 4: Fix xxhdpi drawables (thx blunden)
            Rebased
Patchset 5: Add suggestions
            Sync on boot the system property with the setting
Patchset 6: Rebased

Conflicts:
	core/java/com/android/internal/util/cm/QSUtils.java
	core/res/res/values-cs/cm_strings.xml
	core/res/res/values-el/cm_strings.xml
	core/res/res/values-hu/cm_strings.xml
	core/res/res/values/cm_strings.xml
	core/res/res/values/config.xml
	core/res/res/values/symbols.xml
	packages/SystemUI/res/drawable-hdpi/ic_qs_perf_profile.png
	packages/SystemUI/res/drawable-hdpi/ic_qs_perf_profile_bal.png
	packages/SystemUI/res/drawable-hdpi/ic_qs_perf_profile_perf.png
	packages/SystemUI/res/drawable-hdpi/ic_qs_perf_profile_pwrsv.png
	packages/SystemUI/res/drawable-mdpi/ic_qs_perf_profile.png
	packages/SystemUI/res/drawable-mdpi/ic_qs_perf_profile_bal.png
	packages/SystemUI/res/drawable-mdpi/ic_qs_perf_profile_perf.png
	packages/SystemUI/res/drawable-mdpi/ic_qs_perf_profile_pwrsv.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_perf_profile.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_perf_profile_bal.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_perf_profile_perf.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_perf_profile_pwrsv.png
	packages/SystemUI/res/drawable-xxhdpi/ic_qs_perf_profile.png
	packages/SystemUI/res/drawable-xxhdpi/ic_qs_perf_profile_bal.png
	packages/SystemUI/res/drawable-xxhdpi/ic_qs_perf_profile_perf.png
	packages/SystemUI/res/drawable-xxhdpi/ic_qs_perf_profile_pwrsv.png
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java
	services/java/com/android/server/SystemServer.java

Change-Id: Ib32d3734b63f88a3473e0ab10d8edf30dae9ceb6
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>