Implement runtime display (test) (#318)

* Implement runtime display (test)

* Update runtime.cpp

* [game display] add "-nodisplay" argument

* style fixes

* Update gfx.cpp

* [deci2server] fix deadlock when killing a Deci2Server

* add libxrandr to linux github test

* correct package name to libxrandr-dev

* set g_main_thread_id in exec_runtime

* add libxinerama to linux test packages

* correct the name

* add libxcursor1 package

* Update linux-workflow.yaml

* add libxi-dev

* fix constructor for g_main_thread_id

* fix submodules + use -nodisplay during tests

* move the gfx loop to its own function and use a lambda for exit conditions

* fix include

* fix include

* fix includes (for real this time)

game/system/Deci2Server.cpp

@@ -31,6 +31,9 @@ Deci2Server::Deci2Server(std::function<bool()> shutdown_callback) {
 }
 
 Deci2Server::~Deci2Server() {
+  close_server_socket();
+  close_socket(new_sock);
+
   // if accept thread is running, kill it
   if (accept_thread_running) {
     kill_accept_thread = true;
@@ -39,9 +42,6 @@ Deci2Server::~Deci2Server() {
   }
 
   delete[] buffer;
-
-  close_server_socket();
-  close_socket(new_sock);
 }
 
 /*!