filler rework ( #449 )
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* add chapter statistics and new filler options
* refactor playout builder
* more refactor prep for filler
* rewrite schedulers
* refactor collectionkey
* add tail filler kind
* migrate tail filler to filler preset
* optionally show filler
* fix playout detail row count
* remove duration tail filler options
* implement tail and fallback in flood scheduler
* implement tail and fallback in one scheduler
* implement tail and fallback in multiple scheduler
* implement looping fallback filler
* more duration tests
* start to add post-roll filler to flood
* rework playoutitem filler tagging
* rework scheduler logging
* calculate whether configured filler will fit
* implement pre-roll and post-roll duration and count filler
* improve duration filler calculation
* add minutes to search index
* update channel guide to work with new filler
* add mid-roll filler
* don't clone enumerators for filler calculations
* support pre-roll and post-roll pad filler
* implement mid-roll pad filler
* allow clearing filler selections in schedule editor
* fix tests
* filler config validation
* use consistent time zone for tests
Jason Dove