Fix download and play state issues. Also store that information in DB instead or trying to guess it.
Resume paused episode playback also from the episode listing.
Updated live tile support for subscriptions.

For some reason the background agent isn't running in debug mode.
Refresh the subscription when opening from the pinned live tile.
In debug mode, show ShellToast when background task is run.
Fix background agent.

- Use the date parse method from PodcastFactory to get the correct DateTime.
- Call NotifyCompleted() also in case we don't have any tiles to update.