Version 6.3.0 brings several changes:

* improved handling of playing next in queue when some items have been removed from the queue
* changed toggle play state logic: New or Unplayed -> Played, Played -> Unplayed
* episodes list views are more efficient and less error-prone, reduced dependence on events and relying more on DB live updates
* added episode counts in queues list spinner in Queue view
* resorted handling of various DB objects to managed type
* took out the long-useless context menu codes from episodes list views
* fixed crash when toggling Podcini during downloads
* calmed some complaints on StrictMode policy UntaggedSocketViolation
* adjusted some Composable sizes