Implement kernel tweaker performance menu

Credit: AOKP / Dirty Unicorns / Omnirom

Conflicts:
	res/values/liquid_strings.xml

Conflicts:
	res/values/liquid_strings.xml
	res/xml/settings_headers.xml
	src/com/android/settings/Settings.java

Change-Id: I4d17f331f3132b98827cab5662ba6c23a5c30b32