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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/drawable-xhdpi/ic_sysbar_back_land.png
	packages/SystemUI/res/layout-sw600dp/navigation_bar.xml
	packages/SystemUI/res/values/ras_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyButtonView.java
fix 4.4 build errors