Revert "InCallUI: add decline and answer  incoming call action on notifications (1/2)"

This reverts commit c2a5d21dcf4954524c555eb9e48be12d5474352c.
Revert "InCallUI: Incoming Call in Background (1/3)"

This reverts commit c6e504b92532e8f63d614eef2f70396b9919c169.
Revert "Remove non intrusive incall ui (3/3)"

This reverts commit 32b74af2f921dacbd36d2675d7064f6d9f49d770.

Conflicts:
	AndroidManifest.xml