Introduce "Top queue item" setting for continuous playback

> while I am at it I would like having the player start playing from the top of the queue when new episodes are added. Of course after the current episode is played.
> @cdysthe in https://github.com/AntennaPod/AntennaPod/issues/1414#issuecomment-159448272

Wholeheartedly agree. Currently, the 'add to top of the queue' option doesn't make much sense: Imagine a line (queue) to enter a concert, where VIPs may enter at the front of the line (add episodes to top of the queue). Then what's the point of having ppl added in front of the line (top of the queue) if you let ppl enter (episodes play) who are half-way in the line (just because they happen to be behind the person that last entered). The logic of a line (queue) I think is: first in line, first entrance (rather than first next person in line after the one that just entered).

Then why still add episodes to the top if playback starts somewhere in the middle? The aim (in my world) of 'add to top' is to make the queue have the most recent episodes first. However currently playback will always end up somewhere in the middle of the queue, and I won't always listen to the most recent episodes first.

Currently I always manually drag & drop the currently playing episode to the top, which is really cumbersome.

Curious to see @mfietz' & @TomHennen's viewpoints. If not standard behaviour, I'd advocate for a setting to enable this (new setting under 'Queue').