Added file to disable overlay

Disable the overlay by creating a file disable_overlay.txt next to steam_api.dll

dll/dll.cpp

@@ -212,6 +212,7 @@ STEAMAPI_API bool S_CALLTYPE SteamAPI_Init()
     Steam_Client* client = get_steam_client();
     client->userLogIn();
 #ifndef NO_OVERLAY
+    if( client->enable_overlay )
         client->steam_overlay->SetupOverlay();
 #endif
 

dll/steam_client.cpp

@@ -41,11 +41,15 @@ static void background_thread(Steam_Client *client)
 
 Steam_Client::Steam_Client()
 {
-
     uint32 appid = create_localstorage_settings(&settings_client, &settings_server, &local_storage);
     std::string items_db_file_path = (Local_Storage::get_game_settings_path() + "items.json");
 
-    network = new Networking(settings_server->get_local_steam_id(), appid, settings_server->get_port(), &(settings_server->custom_broadcasts));
+    {
+        std::ifstream chk_ovlay(Local_Storage::get_program_path() + PATH_SEPARATOR + "disable_overlay.txt", std::ios::in);
+        if (chk_ovlay)
+            enable_overlay = false;
+    }
+    network = new Networking(settings_server->get_local_steam_id(), appid, settings_server->get_port(), &(settings_server->custom_broadcasts), settings_server->disable_networking);
 
     callback_results_client = new SteamCallResults();
     callback_results_server = new SteamCallResults();

dll/steam_client.h

@@ -124,6 +124,7 @@ public:
 
     Steam_Overlay* steam_overlay;
 
+    bool enable_overlay = true;
     bool user_logged_in = false;
     bool server_init = false;
     std::thread background_keepalive;