Temp fix for spdlog + initial log to file implementation

Reduces verbose output by logging additional information to logs/game.log.

game/runtime.cpp

@@ -75,7 +75,7 @@ void deci2_runner(SystemThreadInterface& iface) {
     throw std::runtime_error("DECI2 server init failed");
   }
 
-  printf("[DECI2] waiting for listener...\n");
+  spdlog::debug("[DECI2] Waiting for listener...");
   // spdlog::debug("[DECI2] Waiting for listener..."); --> disabled temporarily, some weird race
   // condition?
   bool saw_listener = false;