Added a hook to change the map during an hosted game

F5 to choose it

src/multiwait.c

@@ -344,6 +344,13 @@ wait_for_players ()
                 done = 1;
             }
 
+	    if ((GT_MP_PTPM) && keys[SDLK_F5] && (!keypressed)) {
+            	/* Map modification */
+	    	menu_get_text ("Enter the path of a field file", bman.fieldpath, 30);
+		draw_logo();
+		chat_drawbox();
+            }
+
             chat_loop (&event);
         }