* Add type hints to `tests/rest`

* newsfile

* change import from `SigningKey`

Part of #9744

Removes all redundant `# -*- coding: utf-8 -*-` lines from files, as python 3 automatically reads source code as utf-8 now.

`Signed-off-by: Jonathan de Jong <jonathan@automatia.nl&gt;`>

This was never used, so let's get rid of it.

The two are equivalent, but really we want to check the HTTP result that got
returned to the channel, not the code that the Request object *intended* to
return to the channel.

The root resource isn't necessarily a JsonResource, so rename this method
accordingly, and update a couple of test classes to use the method rather than
directly manipulating self.resource.

Add some useful things, such as error types and logcontext handling, to the
API.

Make `hs` a private member to dissuade people from using it (hopefully
they aren't already).

Add a couple of new methods (`record_user_external_id` and
`generate_short_term_login_token`).

It wasn't possible to hit the code from the API because of a typo
in parsing the request path. Since no-one was using the feature
we might as well remove the dead code.

This reverts commit d7265977.

Add storage function to get all receipts for a user. Also add some cache invalidation to the receipts storage because there wasn't any, and remove a method that was unused.

Store nothing instead of ['dont_notify'] for events with no notification required: much as it would be nice to be able to tell between the event not having been processed and there being no notification for it, this isn't worth filling up the table with ['dont_notify'] I think. Consequently treat the empty actions array as dont_notify and filter dont_notify out of the result.

Split out the push rule evaluator into a separate file so it can be more readily reused. Should be functionally identical.

Catch any exceptions in the pusher loop. Use a lower timeout for pushers so we can see if they're actually still running.