s different plugins discover more precise relations to each other, the values should be further tweaked.

Usage example:

```python
@plugins.event_priority(-100)  # Wishing to run this after all other plugins' `on_files` events.
def on_files(self, files, config, **kwargs):
    ...
```

New in MkDocs 1.4.
Recommended shim for backwards compatibility:

```python
try:
    from mkdocs.plugins import event_priority
except ImportError:
    event_priority = lambda priority: lambda f: f  # No-op fallback
```
c