[3.x] Move collision layer and mask into CollisionObject.

[madmiraal]

3.2 version of #42770.

[madmiraal]

Rebased following merge of 4287af5.

[madmiraal]

Rebased following merge of 015973d.

[madmiraal]

Updated the documentation as suggested here.

[madmiraal]

Rebased following e4addff.

[akien-mga]

I wonder how this impacts compatibility for GDNative or other language bindings? Moving methods to a parent class should be transparent to GDScript but it does break the ABI, no?

[madmiraal]

I wonder how this impacts compatibility for GDNative or other language bindings? Moving methods to a parent class should be transparent to GDScript but it does break the ABI, no?

It doesn't, because the inherited methods have the same signature as before. This PR simply removes the duplication of defining (and in this case also declaring) them in their child classes. It resolves #26680: the current duplicate declaration prevents people using a pointer to the parent class to call the methods defined in the child classes. However, everyone can continue to call the individual methods in each child class as before.

[akien-mga]

Thanks for the confirmation, sounds good to me then 👍

[akien-mga]

Thanks!