Loading a game causes some errors

[LordGolias]

When loading a saved game, there is often already spawned spawns (e.g. locations). Because the load has to erase everything and put them back, e.g. locations became nil and errors pop up.

It would be great to, at load:

1. stop all existing spawns
2. stop spawn loop
3. stop all missions
4. load game
5. start spawn loop
6. start missions

so that there is no error on loading.

The errors may break the spawn loop, causing locations to not be spawned.