Add AbstractPort

Description of issue:

Rename the existing class from Port to AbstractPort and add a Port interface class that inherits from ABC. Can use the existing Port tests to conform that the functionality is still working.

Linked Requirements:

( Y )

Potential Issues:

None

Blockers:

( #X )

Issue Requirements:

1. Class structure should conform with the Class Diagram in the Architects Documents.

Comment:

Should be easy to implement.