Add a "misc_debug" console command

Add a flag to open veh window when TrainBrakesOverheatedBreakdown called

src/debug.cpp

@@ -60,6 +60,8 @@ std::string _loadgame_DBGL_data;
 bool _save_DBGC_data = false;
 std::string _loadgame_DBGC_data;
 
+uint32 _misc_debug_flags;
+
 struct DebugLevel {
 	const char *name;
 	int *level;