Task LSMR-14: Added missing properties and altered relation attributes to match the current spec by the architect

Task LSMR-14: Reverted previously disimproved paths so that we have a working and contained package again; fixed model tests for new choices

LSMR-14: implemented (semi)static choices with foreignkeys and automatic population of the inital database.

models/serializers/viewsets

Task LSMR-13: fixed work io roles and added test coverage, renamed request relation template according to input by JDM

Task LSMR-13: Added some simple tests for the GeneratorTemplate model. Postgres-specifics are commented out until the test setup can handle that.

Task LSMR-13: Added some simple tests for the GeneratorTemplate model. Postgres-specifics are commented out until the test setup can handle that.

Task LSMR-13: Implemented template models and added a basic rest viewset for GeneratorTemplate. Postgres-specifics are commented out until the test setup can handle that.