Create new com.android.ex.camera2.utils package

It contains:
 - Camera2RequestSettingsSet class for storing/unioning CaptureRequest.Builders
 - A Camera2CaptureListenerSplitter class for connecting multiple such listeners
 - A Camera2CpatureListenerForwarder for relaying callbacks to another Handler

Change-Id: I47381e4a45b4232b86e5498a1cc39cc600b5c5c5
8 files changed