Allow to hide listened podcast episodes and show only n number of episodes.
Fixes #3696
Fixes #3475
Fix a date parser for one podcasts
Cherry pick make format changes
Fix problems with code
A better error url
Merge pull request #4651 from sobkas/fix

Fix the parsing of some strange date formats in podcasts, and add a way to limit the number of podcast episodes shown, and hide listened podcasts.  Fixes #3696, fixes #3475