OmniSwitch: only handle back key for hiding

Should also fix the problems when using s-pen
Also fix the flickering on dimmed background

Change-Id: If68c9f4247795ae860d85468ca8b4181e47879b9
OmniSwitch: added horizontal gravity support

Optimized show code - reduced time to show ovwerlay
by a large amount

Change-Id: I2b64c70fafbae99b147fbdc314ddd3f7dca44547
OmniSwitch: RU translation

Change-Id: I46554573d55ff433c91d6d389bd95fdba678978e
Merge pull request #7 from omnirom/android-4.4

merge