Fix body material defaulting some state

[Ardot66]

Resolves #492
Resolves #488

This prevents RapierCollisionObjectBase from overwriting material properties that should only be set by RapierBody. Namely bounce and friction, but also contact skin and soft ccd.

I just threw this together because I realized it would be simple to fix this way, but if this seems too hacky I can set up a system where body_update_material takes two material parameters: a new BaseMaterial and the standard Material, where they each handle their respective collision object type, and the Material is optional to allow RapierCollisionObjectBase to modify things safely.

[Ughuuu]

Kinda beats the purpose of the material. Not a big fan of this, but if it works I guess it's ok. I would rather either have 2 functions, and not have the bool param, or not have the material and instead have optional parameters, or just construct the material correctly.
Anyway, have you tested locally to see if it works? About the 3d thing failing, that was a mistake from me, will fix it in a later PR.

EDIT:
Oh, I see, base as in ObjectBase. Ok, then I think the naming is ok. My bad, read it quickly and didn't realise. It's not as bad as I initially thought.

[Ardot66]

I tested locally and it worked as expected, at least for bounce. As for splitting it into two functions, I could set that up later if you want to hold off on merging.

[Ughuuu]

Nah, it's ok like this. You can if you want as a future PR, though it's not bad as it is right now. Thanks for contributing!