Add random episodes to playlist in playlist management

[funkenstrahlen]

Sometimes playlist creators do not have a lot of time to schedule episodes. In playlist management implement function to add random episodes to the schedule.

• Filter episodes using the search or some search criteria (duration, last played, ...)
• Adjust how many random episodes to add OR select date in the future so the schedule is filled automatically with random episodes until this date
• press the ADD RANDOM button
• the random add function should only add episodes from the search query. if there is not query, random from all episodes

[funkenstrahlen]

Maybe it is a good idea to rename current playlist management to schedule management to differentiate better between those two things.