[safety-creation] Small fixes

- Delete Assurance Claim Patterns Database from the Context Menu of Assurance Package elements;

- Delete “Type” from the Properties View of Argument Modules and in the metamodel;

- Implement:

—- ExplicitCase requires to document goal decompositions via strategies. Therefore, a constraint
on the assurance case model enforces the existence of a strategy node whenever the user wants
to connect two goals.

—- Avoidance of circular argumentation

(from redmine: issue id 4054, created on 2020-08-13, closed on 2020-10-20)

• Relations:
  • parent #3784