Navigation bar buttons customization

Navigation bar buttons customization: Padding fix
Fix padding calculation

Navigation bar buttons customization: Fix left over glow
Invalidate all buttons, to avoid nearby glow interference

Conflicts:
	packages/SystemUI/res/values/ras_strings.xml
volume rocker wake and volume rocker music control

Conflicts:
	core/java/android/provider/Settings.java
Revert "volume rocker wake and volume rocker music control"

This reverts commit 7655e2cf2ce76e76f9579d277c2fa639a4154dd6.
Revert "Navigation bar buttons customization"

This reverts commit 8f74e68b6dd796bde73f28ca833d5ca697f0aa5d.