* start to add program schedule alternates
* edit days of the week
* editor improvements
* save changes
* build playouts using alternate schedules
* reset playout as needed
* add priority message
* start to add multi-collections
* create multi collection with no items
* edit multi collections
* fix plex credentials threading issue
* add playback order to multi collection items
* group episodes outside of shuffled enumerator
* move playback order onto each schedule item
* fix multi collection grouping
* update changelog