Updated the message send/receive pipelines to better handle config and updated group messages
Changed the hard-coded 'WebSocketRequestMessage' proto wrapper to not have random data
Removed the old 'SharedConfigMessage' (deprecated and removed within 'libSession')
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