Refactor of the channels persistence code, along with changes relating to new Channel fields
Get method names for channel numberings have changed, causing knock-on changes in persistence
channel number field changed to string
Merge branch 'mbst-4019-ingest-pa-channel-data' into stage

Conflicts:
	src/main/java/org/atlasapi/persistence/media/channel/ChannelNumberingTranslator.java