Added the DeveloperSettingsViewModel and dependency-controlled feature flags
Added the generic 'SessionListViewModel' to reduce duplicate code when we want to just display a selectable list of items
Added an indicator on the home screen to show when using testnet
Added group promotions behind a feature flag
Updated the PushNotificationAPI to use bulk subscribe/unsubscribe requests
Updated the 'GroupUpdateDeleteMessage' and 'GroupUpdateDeleteMemberContentMessage' to support additional behaviours
Updated the SessionCell to have better RTL support (swapped some left/right things to leading/trailing)
Updated the revoke/unrevoke endpoints to take arrays of subaccount tokens
Refactored the Bencode logic to properly support Codable types
Started refactored some logic to make it easier for unit testing
Started updating SnodeAPI calls with prepared requests
Fixed some issues with the PreparedRequest 'map' and 'handleEvents' functions
Genericised common pre-request behaviours for SnodeAPI calls
Started writing up wrappers and unit tests for group config types
Refactored some duplicate batch & prepared request code to be more generic and reusable
Renamed a number of legacy closed group functions to have the term 'legacy' in them for ease of coding