The function `rna_def_attributes_common` assumed that the owner of the
attributes is an `ID`. This PR refactors the code to partially remove this
assumption.
The `rna_def_attributes_common` function now takes an argument
`AttributeOwnerType type` that defines what `AttributeGroup` should be used.
This is in preperation for #116043 where we want to use
`rna_def_attributes_common` for grease pencil drawings, which are not IDs.
In addition to the refactor explained above, this also changes the API
slightly:
Previously, the `AttributeGroup` defiend `active_color`,
`active_color_index`, `active_color_name`, `default_color_name`, and
`render_color_index` for all IDs. These properties could only be used by
meshes. So this PR seperates the `AttributeGroup` type into one type
per attribute owner: `AttributeGroupMesh`, `AttributeGroupPointCloud`,
`AttributeGroupCurves`, and `AttributeGroupGreasePencil`.
As such the properties mentioned above are now only usable by meshes.
Note that this technically breaks the API and will have to be noted in the
release notes.
Pull Request: https://projects.blender.org/blender/blender/pulls/123658
07bc687785