agent: xrcp implementation for connection via link (no multicast) (#884)

* WIP: start working on connection invites

startSession/OOB is broken now - the port isn't coming from the actualy assigned one.

* Add invite types

* clean old invite-related types

* apply renames

* Move SessionKeys from Invitation

* Stub host-side keys and handle

* move keys and handles to Types

* add Simplex.RemoteControl.Client

* more keys

* progress

* crypto for sessions

* progress to multicast

* multicast crypto

* add RC TLS server

* agent api for remote control

* WIP: tls client

* fix test

* update encoding to include nonce

* add TODO

* update

* Use network-info to find TransportHost

* request and submit tls client certificate

* WIP: add missing bits for testing RC client

* RCEncryptedHello encoding

* add block encoding

* refactor

* validate known host certificate

* remove some spaghetti

* functional API to host/ctrl clients

* refactor connectRCCtrl_

* refactor connectRCHost

* question

* add type

* fix RC session

* update doc

* update doc 2

* add block on confirmation

* remove unused parameter

* export CtrlSessKeys

* export

* fix parsing

* move test of xrcp handshake

* move KEM to HELLO step

* fix JSON

* type

---------

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

src/Simplex/FileTransfer/Protocol.hs

@@ -51,7 +51,6 @@ import Simplex.Messaging.Protocol
     tEncode,
     tEncodeBatch,
     tParse,
-    _smpP,
   )
 import Simplex.Messaging.Transport (SessionId, TransportError (..))
 import Simplex.Messaging.Util (bshow, (<$?>))