* add category and local display name to group members, extend member status
* additional chat commands, serialization
* parse all chat messages
* draft group protocol implementation
* group protocol: connect new member to existing members (TODO fix race condition with contact connection)
* send/receive group messages (race condition still there - the 3rd member cannot send either group or direct messages to the 2nd member - CONN SIMPLEX)
* send x.grp.mem.info and x.ok in SMP confirmation
* fix host user adding new member, update simplexmq to fix sqlite concurrency, remove logs, make # optional in chat commands
* more precise view messages about members joining and connecting
* track connection status; only send messages to active members (TODO change to current members); group name autocomplete after joining the group
* track via which group the contact was added; show only one message when a contact fully connected; group tests
* test sending messages to the new direct contacts created via the group
* update simplexmq to include .cabal file
* remove unused import
