Add forceHighEndGfx property to override isHighEndGfx

Change-Id: If2cbe9f1eba1a69c1c5c65364e98e4bc1b046ab5
Add setting to enable or disable navigation bar

Change-Id: Ia2eecd48cbc6f219b30eb157964cf4ca47f714c2
Merge remote-tracking branch 'sgt7/cm-11.0' into cm-11.0-sgt7