65c23dc7c6
An Action slot usually has a specific ID type (`ActionSlot::idtype`). When this is set to 0, it is not specifc to any particular ID type. The latter case was called "unbound", and is now called "untyped". Note that untyped slots are given an ID type as soon as they are actually assigned to any ID. No functional changes. Pull Request: https://projects.blender.org/blender/blender/pulls/133651