### Description
Some combination of preload/postload and autoloding playlists with
smartblocks generate massively overbooked shows that clutter up the
interface. This addition performs a 'trim overbooked' after filling up
the autoload list, and does the same as pushing the 'trim overbooked'
button in the UI.
### Testing Notes
Define an autoloading playlist of 2 hours and schedule it for a one hour
show. Without patch, you'll get entries for 2 hours, with the patch, you
only get one hour and a 'overboarding' orange entry at most.
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Co-authored-by: Kyle Robbertze <paddatrapper@users.noreply.github.com>
Co-authored-by: Thomas Göttgens <tgoettgens@mail.com>
Co-authored-by: jo <ljonas@riseup.net>
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