Assign an Option Set Action should be controlled by dedicated Role

[OliverDroop]

Today only Library/Product Managers can assign option sets. This is a valid condition for assigning option sets to a complete context but NOT for assigning an option set to a configurable BOM a process plan. Therefore this action needs to be available for business roles as well.

For this the action validator logic should be changed to take
- Modify Permission on PBO
- Role Member of Option Manager or configurable role via preference for that context
- Member of correct license group

[BartLefevere]

The condition that the user must be a Context Manager to Assign Option Set is still valid in Windchill 12. In a real business situation it is not possible to put an Option Manager in that role. And is not practical to delegate this task to an Organization Administrator.

[ToddSwartz]

This needs to be addressed by PTC.  We cannot and will not grant such high level authorities for a standard task for an Options Manager.  Instead the Options Manager has to request Admins to do the updates for them and this slows development.