HeadsUp: Only remove heads up if attached to window

Attempting to remove mHeadsUpNoficiationView from the window manager
when it is not currently attached will throw an IllegalArgumentException
so we check if it is attached and if so remove it, otherwise carry on.

Change-Id: Ida916eba496c4183e47288ef24a8a93c46a7eddf

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
add framework torch service

Change-Id: I0c7a055b33fdebe697f23d207b20408e06eb74a8
Signed-off-by: Roman Birg <roman@cyngn.com>

Conflicts:
	core/java/android/content/Context.java
Fully fix interaction between torch and camera usage.

For doing this, two things are necessary:
- The torch shutdown needs to be synchronous, so that the torch app has
  a chance to release the camera before the camera app tries to use it.
- The torch service needs to track camera usage, so that it can notify
  the torch app if a camera is busy.

Change-Id: I521091d255ff4c251d97a0e8d65c9d2a80b9dae4