core: group fixes/improvements (#7660)

* core: group fixes/improvements

* Large messages dropped by relays and hosts (the same 15602 limit was applied, without accounting for forwarding header)
* Members below v18 did not receive forwarded messages or history in p2p groups.
* Join confirmations near the size limit could fail.
* SMP servers are limited to 2 host names each.

* simplify

* remove legacy forwarding and history support

* only restrict p2p groups

---------

Co-authored-by: Evgeny @ SimpleX Chat <259188159+evgeny-simplex@users.noreply.github.com>

src/Simplex/Chat/Protocol.hs

@@ -924,6 +924,14 @@ $(JQ.deriveJSON defaultJSON ''MsgContainer)
 maxEncodedMsgLength :: Int
 maxEncodedMsgLength = 15602
 
+maxForwardBatchLength :: Int
+maxForwardBatchLength = maxEncodedMsgLength + 161
+
+fwdMemberName :: ContactName -> ContactName
+fwdMemberName displayName
+  | T.length displayName <= 16 = displayName
+  | otherwise = T.take 16 displayName `T.snoc` '…'
+
 -- maxEncodedMsgLength - 2222, see e2eEncUserMsgLength in agent
 maxEncodedMsgLengthPQ :: Int
 maxEncodedMsgLengthPQ = 13380
@@ -965,8 +973,8 @@ rosterBlobP = do
 maxEncodedInfoLength :: Int
 maxEncodedInfoLength = 14694
 
-maxEncodedInfoLengthPQ :: Int
-maxEncodedInfoLengthPQ = 10968 -- maxEncodedInfoLength - 3726, see e2eEncConnInfoLength in agent
+maxEncodedProfileMsgLength :: Int
+maxEncodedProfileMsgLength = 16384
 
 data EncodedChatMessage = ECMEncoded ByteString | ECMLarge