World to local transforms

[ross.grams]

@dapetcu21

I would actually be happier if we could get the entire world transform matrix of an object. It’s much more useful if you want to transform between coordinate spaces.

This.

Right now, doing world-to-local and local-to-world transforms with game objects is impossible (without knowing/assuming the full GO hierarchy and composing the transforms down the tree). I think the simplest way to fix this is to add a go.get_world_transform() function that returns the complete transform matrix, since I am only using go.get_world_rotation() to reconstruct that matrix anyway.