load next could be pre-loaded from 80% e.g. and not shown

[vankasteelj]

Idea: instead of waiting for the player to be closed and the episode being marked as seen, above 80% of seen video, maybe there's a way to do this before (1), when we hit 80%, so it's pre-loaded in cache and ready to be displayed if need so. And if the video is closed before that (2), no worries, we just change back.

=> point 1 will happen most of the time, 2 should be anecdotical.

This could improve UX