Add Extended Power Menu (Reboot, Recovery, Download & Screenshot Options)

Add support for Extened Power Menu in SuperNexus.
-Reboot
-Recovery
-Download/Bootloader
-Fastboot
-Screenshot

Conflicts:
	core/res/res/values/symbols.xml
	policy/src/com/android/internal/policy/impl/GlobalActions.java
	services/java/com/android/server/power/ShutdownThread.java