- Adds register endpoint in the API
- Adds the Gatekeeper to keep track of registered user and allow/reject access
- Adds registration errors
- Updates API unit tests
- Refactors some methods of the API to reduce code replication
When posting a request via requests.post the json field was dumped to json, but it shouldn't have been since requests deals with this internally. That meant that the requests made by the code didn't match proper JSON.
In line with this, the API was only parsing this type POST requests correctly, making add_appointment to fail if a proper formatted JSON was passed.
On top of that, empty appointments were not checked in the Inspector before trying to get data from them, making it crash if a JSON was posted to add_appointment not containing the `appointment` field. Unit tests for this should be added.
