Thanks Bouke Haarsma for report, fix and initial patch.

Thanks Loic Bistuer.

Detect and use the services of the ANSICON third-party tool if it's
available.

Thanks Tim Graham for the report

Fixed #21545 -- autoreload kqueue events weren't cleared which caused an infinite loop.

This code seems to be an artifact of AdminMediaHandler removed in [5c53e306].

Thanks jared_mess for the report.

Thanks svartalf for the report.

Faulty line was introduced in 50a8ab7c.

Thanks Rémy Hubscher, Ramiro Morales, Unai Zalakain and
Tim Graham for the reviews.
Also fixes #16084.

Refs #20199 #16986.

Thanks @akaariai, @bmispelon, @mjtamlyn, @timgraham for the reviews.

Previously when collecting static files, the directories would receive permissions
from the global umask. Now the default permission comes from FILE_UPLOAD_DIRECTORY_PERMISSIONS
and there's an option to specify the permissions by subclassing any of the
static files storage classes and setting the directory_permissions_mode parameter.

Use 'update_fields' in RelatedManager.clear() when bulk=False.

Thanks Simon Charette for the suggestion.

Refs #21169.

Thanks Rhett Garber for the report and initial patch.

Thanks to trac user oubiga for the report.

Thanks Preston Holmes for the draft text.

Fixed typo in release notes.

Refs #21169

Refs #21169

Refs #21169

The `remove()` and `clear()` methods of the related managers created by
`ForeignKey`, `GenericForeignKey`, and `ManyToManyField` suffered from a
number of issues. Some operations ran multiple data modifying queries without
wrapping them in a transaction, and some operations didn't respect default
filtering when it was present (i.e. when the default manager on the related
model implemented a custom `get_queryset()`).

Fixing the issues introduced some backward incompatible changes:

- The implementation of `remove()` for `ForeignKey` related managers changed
  from a series of `Model.save()` calls to a single `QuerySet.update()` call.
  The change means that `pre_save` and `post_save` signals aren't called anymore.

- The `remove()` and `clear()` methods for `GenericForeignKey` related
  managers now perform bulk delete so `Model.delete()` isn't called anymore.

- The `remove()` and `clear()` methods for `ManyToManyField` related
  managers perform nested queries when filtering is involved, which may
  or may not be an issue depending on the database and the data itself.

Refs. #3871, #21174.

Thanks Anssi Kääriäinen and Tim Graham for the reviews.