Multi-date listings

- Tidied up subChannelResponseMaker
- ArticleRepository::getCategoryArticle now uses event_showTime
- ChannelRepository::getChannels now check for is_active and is_deleted
- New show time relationship for events. Removed validation rules
- New events/ShowTime model
- Tidied up ChannelListingResponder
- Tidied up ChannelListingResponder
- Tidied up ChannelResponse. Now provides day to ListingTransformer
- Tidied up ArticleTransformer
- EventTransformer now calls ShowTimeTransformer
- reworked listingTransformer
- New ShowTimeTransformer
- Bug fixes to integrate show times across the board
Adding in correct array position
Changing API base URL for dev
Bug fix for broken search
Merge branch 'multi-date-events' into dev-260714-0525