Themes: Let ThemeService handle all theme processing [1/3]

Only themes that are applied will be processed inside of the
PackageManagerService, all others will be sent off to the
ThemeService.

Conflicts:
	core/res/res/values/cm_strings.xml
	core/res/res/values/symbols.xml
	services/java/com/android/server/ThemeService.java

Change-Id: I5f2ec628e1d22a05accc6727efb0c1387455f82f

Conflicts:
	core/java/android/content/res/ThemeManager.java
	core/res/res/values/strings_custom.xml
	core/res/res/values/symbols_custom.xml