v1.1.2: API Endpoints. (#50)

* Roles endpoint now works.

* Comment and docstring.

* Move endpoint to allow for a user-roles endpoint.

* Start adding scopes.

* Schema fix.

* General API improvements.

* Simplify to use ViewSets.

* Add searches, filters and ordering.

* Fix schema again.

* User Services.

* Better service roles view.

* Tidy up the old way.

* Final scopes, update dependencies.

* Fix dependency installation in tests.

* Order is important.

* Rename serialzer to prevent duplicates.

* Update.

* Update utils.

* Update utils.

* Add categories view.

* tox4 -> tox

* Dependency loop.

* Tests for API now run.

* Two tests now work.

Aside from on python 3.8?

* Tests for python3.8 run: force tox to install backports.zoneinfo.

* Add test for black.