 Version 7.2.2

* likely fixed FeedEpisodes opening with null episodes
* likely fixed action button becoming question mark in FeedEpisodes
* fixed failures of deleting media files using uri strings
* fixed auto download replace policy
* enhanced episodes lists progressive loading
* avoided crash when playing unreleased youtube media
* added some error messages in streaming Youtube media
* reduced font size a bit in episodes and subscriptions filter dialogs
* encapsulated variables in some fragments
