Got the updated file upload working
Removed the legacy 'room' header
Consolidated a number of types between SOGS, FileServer and general requests
Updated the OnionRequestAPI to deal with a Data payload (rather than encoding it to a string and then back to data)
Fixed an incorrect optional in RoomPollInfo
Fixed an incorrect parameter name in the ClosedGroupRequestBody
Fixed a crash due to a change in the ContactUtilities
Cleaned up the duplicate code in the OnionRequestAPI, HTTP and SnodeAPI to all use 'Data' response types
Updated the SnodeAPI to casting types to Any (made it hard to catch breaking changes with HTTP and OnionRequestAPI)
Added in the v4 onion requests logic
Added in the new pin/unpin APIs
Split up additional legacy methods to try and simplify the refactoring
Added a number of TODOs around usage of legacy request methods
Updated the MessageSendJob to support V4 messages (V2 messages will be upgraded to V4 if they get re-encoded)
Renamed the Message+Destination from 'openGroup' & 'openGroupV2' to 'legacyOpenGroup' and 'openGroup'
Started plugging in more of the V4 APIs
Renamed a number of the V2 APIs to start with 'legacy'