[BUG] Persistent actors such as spawned beans don't get saved

[AdamJD01]

For example, if you open a chest or knock over a cauldron and don't collect the beans then they are gone when you reenter the level.

[metallicafan212]

Fixed by making all actors push their class name to the PA so I can use that to spawn them when loading.

All save files created before the next version need to be deleted.