Compact editor photo picker 1/2 (E15)

* Added photo selection fragment
* Swap between editor and photo selection fragments in CompactEditorActivity
* Moved PhotoHandler (which receives callbacks from PhotoSourceDialogFragment)
  from the editor fragment to CompactEditorActivity since sourcing a photo
  happens now from the editor photo view and the action bar when in the
  photo selection fragment is visible.
* Extract code to get a bitmap or full size photo from a ValuesDelta in
  CompactEditorPhotoView and move it to EditorUtiUtils so that it can be used
  on both the photo selection fragment and the photo view

Bug 19697372
Bug 23589603

Change-Id: Iecebca44f505527d0be7a3803cd1d8fd4fef65e0