Add mechanism for wrappers to work with each other

[pablo-de-andres]

In GitLab by @urbanmatthias on Feb 4, 2020, 09:36

There are cases where simulation wrappers want to:

• use reasoning (implemented in an upcoming reasoning wrapper)
• use a database (to store cuds objects)

Implement a possibility s.t. wrappers can directly interact with each other (possibly share a registry).