Show warning dialog if NewGRFs use too many string IDs.

Show when reloading/changing NewGRF config, or starting new game.

src/console_cmds.cpp

@@ -1897,6 +1897,9 @@ DEF_CONSOLE_CMD(ConNewGRFReload)
 	}
 
 	ReloadNewGRFData();
+
+	extern void PostCheckNewGRFLoadWarnings();
+	PostCheckNewGRFLoadWarnings();
 	return true;
 }