WIP commit - interim refactor of episode detail view.
Merges develop
Allow ward rounds to move through patient details by modularising
details view and establishing the concept of "Controller Mixins".

refs openhealthcare/opal-wardround#1
Select correct template path for header templates.

refs openhealthcare/elcid#359
Allow adding of episodes from detail controllers.

refs openhealthcare/elcid#57
Pass schema through as well
Remove OPAT from user categories