* Changed email batching short-circuit logic to look at last viewed at timestamp in channel member struct instead of in user's status struct, since the latter is only updated if the user's status is set to online
* Fixed unit tests
* Reduced right-hand drift
* Reduced total number of store calls by loading all channel member objects for user exactly once per team that the user received notifications for
* PLT-7195: Added new config option, new license feature, and config UI to system console. Still need to implement behaviour change in email batching code
* PLT-7195: Modified batch emails to respect email notification content type setting
* PLT-7195: Tweaking the colours a bit
* PLT-7195: Added support for email notification content type setting in immediate (non-batched) notification messages. Attempted to clean up the code somewhat. Unit tests coming in a future commit
* PLT-7195: Added unit tests for non-batched emails
* Checked license when applying email content settings
* Changed return type of getFormattedPostTime
* PLT-7177: Found default preference that needs to be changed
* PLT-7177: Front end behaves as desired
* PLT-7177: Changed default batching interval on server side
* PLT-7177: Added unit tests for new default interval
* PLT-7177: Removed unused import
* PLT-7177: Renamed constants to increase clarity
* Add app package and move logic over from api package
* Change app package functions to return errors
* Move non-api tests into app package
* Fix merge
