Release 2.1.0 with modular CMake build

src/main.cpp

@@ -530,7 +530,7 @@ main(int argc, char **argv)
                 argv[optind]);
               if (url_data)
                 free(url_data);
-              shutdown();
+              app_shutdown();
               exit(0);
             }
 
@@ -548,7 +548,7 @@ main(int argc, char **argv)
                 free(url_data);
               if (dl_win)
                 delete (dl_win);
-              shutdown();
+              app_shutdown();
               return -1;
             }
           if (dl_win)
@@ -558,10 +558,10 @@ main(int argc, char **argv)
         }
     }
 
-  shutdown();
+  app_shutdown();
 }
 
-void shutdown(void)
+void app_shutdown(void)
 {
   cleanuprt();