Allow set_passenger to be used on cargo pods

[thesixthroc]

Currently LuaEntity.get_passenger supports cars, spider vehicles and cargo pods, whereas LuaEntity.set_passenger only supports cars and spider vehicles.

This feature seems to be necessary to script-launch a rocket with a player inside.

[thesixthroc]

This could be tricky to implement if it’s a problem the player may have items in their inventories.

Personally I would be satisfied with an API which returns true only if the attempt to have the player enter a cargopod+rocket was successful.

[curiosity]

Surely the items limitation is purely for balance. Meaning it should be for the mod to verify.

[ahicks]

+1 for Factorio Access. We eventually need a way to launch players through vanilla's mechanism and this looks like it may be the last piece of it.

[Rseding91]

Added for the next release.