Mypy/fix pep 484

[eruvanos]

No description provided.

[alejcas]

Hi, shouldn't methods from spatial_hash.py like check_for_collision_with_list also return List[_SpriteType] instead of List["Sprite"]?

Thanks

[alejcas]

for example if I have a subclass of Sprite called Unit whateverUnit.collides_with_list() returns is always expected to be a List[Sprite] and not a List[Unit]