6f050fecfb
This is a PR that is built on top of #122094 (thanks to @SietseB for the initial work). Adds the following properties and functions: * `layer.frames`, * `layer.frames.new(frame_number)` * `layer.frames.remove(frame_number)` * `layer.frames.copy(from, to)` * `frame = layer.get_frame_at(frame_number)` * `frame.drawing` * `frame.frame_number` * `frame.select`: the selection state of the keyframe in the dope sheet * `frame.keyframe_type` * `drawing = frame.drawing` * `drawing.type` (`DRAWING`/`REFERENCE`) * `drawing.user_count`: The number of keyframes that use this drawing * `drawing.attributes`: attribute read/write access to the drawing data To be able to access attributes on drawings, a new `AttributeOwnerType::GreasePencilDrawing` is added. The API in `BKE_attributes.h` is updated to handle this type. In `rna_attributes.cc`, there is a new `rna_def_attribute_group_grease_pencil_drawing` that defines the attribute group. For this to work, it also defines its own rna callback functions. Pull Request: https://projects.blender.org/blender/blender/pulls/124787
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