This speeds up saving `070_0100.anim.blend` from the Heist project from ~3s to ~300ms by adding PROPOVERRIDE_IGNORE in a few places. It's not completely obvious to me when `PROPOVERRIDE_IGNORE` should be used and when it shouldn't. Given that the same is done for meshes already, it seems correct. Pull Request: https://projects.blender.org/blender/blender/pulls/107196