core chat groups protocol for adding members (#78)

* 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

stack.yaml

@@ -43,7 +43,7 @@ extra-deps:
   # - simplexmq-0.3.1@sha256:f247aaff3c16c5d3974a4ab4d5882ab50ac78073110997c0bceb05a74d10a325,6688
   # - ../simplexmq
   - github: simplex-chat/simplexmq
-    commit: 8ba3e3e45a6006d173738db9eac1068edad74df7
+    commit: 53aadca635a6953bd18a305423783b0d71a13cb6
   # this commit is in PR #164
 #
 # extra-deps: []