Comm session re-architecture and self comm channel. (#145)

* Introduced self comm channel instead of loopback websocket.
* Introduced comm_session and comm_server inheritance hierarchy.
* Separated peer session and user session classes.

src/p2p/peer_comm_session.cpp

@@ -0,0 +1,36 @@
+#include "../pchheader.hpp"
+#include "peer_comm_session.hpp"
+#include "peer_session_handler.hpp"
+
+namespace p2p
+{
+    void peer_comm_session::handle_connect()
+    {
+        p2p::handle_peer_connect(*this);
+    }
+
+    int peer_comm_session::handle_message(std::string_view msg)
+    {
+        return p2p::handle_peer_message(*this, msg);
+    }
+
+    void peer_comm_session::handle_close()
+    {
+        p2p::handle_peer_close(*this);
+    }
+
+    /**
+     * Returns printable name for the session based on uniqueid (used for logging).
+     */
+    const std::string peer_comm_session::display_name()
+    {
+        if (challenge_status == comm::CHALLENGE_STATUS::CHALLENGE_VERIFIED)
+        {
+            // Peer sessions use pubkey hex as unique id (skipping first 2 bytes key type prefix).
+            return uniqueid.substr(2, 10) + (is_inbound ? ":in" : ":out");
+        }
+
+        return comm_session::display_name();
+    }
+
+} // namespace p2p