dynamic API acces token

[Ceetto]

Right now the acces token needed to work with the api is hard coded into the app. This acces token only has a lifetime of about 3 months however.
The plan to make it dynamic is as follows:
An acces token would be stored on the firebase backend. When logging in the user will get the token from the backend. If the token got is expired the user will then request a new token and update the current token in the backend.