This is an optional parameter for int properties, which then show up as
enum properties.
Included fix: reset ID properties' enum items when the `items` parameter is `None`.
Example usage:
```python
import rna_prop_ui
# Add a regular int property.
rna_prop_ui.rna_idprop_ui_create(D.objects['Cube'], "test", default=123, min=-3, max=500)
# Change to an enum property with items (min/max are ignored).
rna_prop_ui.rna_idprop_ui_create(D.objects['Cube'], "test", default=0, min=-10, max=10, items=[("APPLES", "Apples", ""), ("ORANGES", "Oranges", "")])
# Switch back to regular int property.
rna_prop_ui.rna_idprop_ui_create(D.objects['Cube'], "test", default=1, min=0, max=10)
```
Pull Request: https://projects.blender.org/blender/blender/pulls/117289
53da2b2d48