Move some contact editor functionality into new base classes

To make room for a new "compact" contact editor.

The Status and SaveMode interfaces in ContactEditorFragment were
moved to ContactEditorBaseActivity but the Listener interface
was moved to the ContactEditorBaseFragment.

The logic in ContactEditorFragment to construct the result
Intent after successful saves was alos moved to the
ContactEditorBaseFragment.

Bug 19124091

Change-Id: I5dd0b64580026a72757025915ee59be0b7d1dcbc