SuperObjectLayer doesn't have it's type/class info

[Cammin]

Tiled allows us to set a class in objects & layers and more. (previously referred to as types)

SuperObject has a field m_Type to read what the class in Tiled is, and that works well.

Layers in Tiled also allow setting a class:

However, in SuperObjectLayer, there appears to be no field for m_Type or its derived class. It would be very useful to have this. 🙂