[Prototype] Component and Deployment Diagrams

Prototype a _UML Light_ variant of **Component** and **Deployment** diagrams. Initially, this will comprise simply an integration of the _Papyrus UML_ implementation of these diagrams without any adjustment to the concepts supported in other diagrams, especially _Class Diagram_ (for port types) and _Sequence Diagram_ (for connectors as message communication paths in composite structures). Also, this does not imply the support for a **Composite Structure** diagram for components, and therefore connectors aren't in play anyhow.

Work to be done on a branch `components_and_deployments`.