base: added screenshot delete action in notifications

allows deleting a screenshot from the notification
inspired from CarbonRom - initial from CM I guess

Change-Id: I67b7b9a7808ddb8c54ea4f3a45aad6d44833e1df

Conflicts:
	packages/SystemUI/AndroidManifest.xml
Power menu reboot and screenshot

Inspired from:
DvTonder: Power menu options
Justin Koh: Update GlobalActions for watches.
https://android.googlesource.com/platform/frameworks/base/+/3b9a3cc02ecb025f8b1f322015c7d1fb46222f9e