fix the naming and behavior of always-play-range to match the button, which is follow...

fix the naming and behavior of always-play-range to match the button, which is follow-edits.  when you select a range, the playhead should jump to the start of the range and begin to play the selection.  BUT (unlike previous implementation) if the user wants to relocate the playhead, then that should be allowed.  The user should always remain in charge of the playhead location.  NOTE:  your previous config setting will be invalidated.  You must re-save a session to overwrite with the new config variable