Use debug.Log instead of android.util.Log.

see http://ag/438423, merge conflicts solved.

1. Change to use com.android.camera.debug.Log instead of android.util.Log.
2. Add DebugCameraProxy to support more detailed debug info.
3. Add CameraErrorCallback in CameraManager.
4. Support posting to a specific handler for CameraErrorCallback.
5. Trim down some TAGs to match the framework tag length limit.
6. Remove some unused codes in CameraSettings.

bug:13324870

Change-Id: I8c20a8a0d11cfd50b6e199b03cbc88d3c4ad2ceb

Conflicts:
	src/com/android/camera/data/LocalMediaData.java
	src/com/android/camera/data/RotationTask.java
	src/com/android/camera/widget/FilmstripView.java