Support terminal coloring on Windows

E.g. we might use the [colorama](https://pypi.org/project/colorama/) library, otherwise the output looks like this in cmd.exe:

```
←[33mWARNING  -  ←[0mmkdocs_autorefs.plugin: cookbook-reference.md: Could not find cross-reference target '['a']'
←[33mWARNING  -  ←[0mmkdocs_autorefs.plugin: cookbook-reference.md: Could not find cross-reference target '['a']'
```