* on playback start, correct all applicable media duration if difference is greater than 5 seconds
* in updateFeedFull, avoid resetting episode duration if status greater than Progress
* amended MainScreen config to avoid hiding PlayerUI on down swipe
* in onResume of MainActivity, popup confirm message on external apps
* in MediaPlayer,
	* fixed crash when creating the second player
	* ensure Pause button in episodes lists is tied to the player
