Separate configuration flags to turn off item registration/consumption

DMO-1225

It is now possible to setup item registration and item forecast settings so that any combination of these are a valid combination:

• Item registration + item forecast modification: The worker can view, create and edit item registrations and item forecasts
• Item registration: The worker can view, create and edit item registrations
• Item forecast modification: The worker can view, create and edit item forecasts
• None: The worker can do nothing with regards to item registrations or item forecasts