Compilation time improvements. (#52)

* Precompiled header for all common library headers (with cmake 3.16rc3).
* Divided cmake build into shared libraries.
* Added gold linker support.
* Separated websockets lambda expressions to an independent file.

src/usr/user_session_handler.cpp

@@ -1,13 +1,9 @@
-#include <iostream>
-#include <string>
-#include <boost/beast/core.hpp>
-#include <boost/beast/websocket.hpp>
-#include <boost/asio.hpp>
+#include "../pchheader.hpp"
 #include "../util.hpp"
-#include "../sock/socket_session.hpp"
-#include "../proc.hpp"
 #include "../hplog.hpp"
 #include "../jsonschema/usrmsg_helpers.hpp"
+#include "../sock/socket_session.hpp"
+#include "../sock/socket_message.hpp"
 #include "usr.hpp"
 #include "user_session_handler.hpp"
 
@@ -17,17 +13,6 @@ namespace beast = boost::beast;
 namespace usr
 {
 
-user_outbound_message::user_outbound_message(std::string &&_msg)
-{
-    msg = std::move(_msg);
-}
-
-// Returns the buffer that should be written to the socket.
-std::string_view user_outbound_message::buffer()
-{
-    return msg;
-}
-
 /**
  * This gets hit every time a client connects to HP via the public port (configured in contract config).
  */
@@ -98,8 +83,6 @@ void user_session_handler::on_close(sock::socket_session<user_outbound_message>
     // Session belongs to an authed user.
     else if (session->flags[util::SESSION_FLAG::USER_AUTHED])
     {
-        // Wait for SC process completion before we remove existing user.
-        proc::await_contract_execution();
         remove_user(session->uniqueid);
     }