### Description
Having a global intro and outro playlist in settings is not very
flexible for special programming. This adds an override intro/outro
playlist per show. If it is not set, the global one is used. also it's
ignored if there's no autloading at all.
**I have updated the documentation to reflect these changes**:
Yes
### Testing Notes
**What I did:**
Schedule 2 shows, one without defining custom lists, one with defining
custom lists. one hour before the show starts it should be populated
correctly. If you define a global list it shojuld be replaced with the
per-show list.
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Co-authored-by: Thomas Göttgens <tgoettgens@mail.com>
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