Add more Utility/Convenience Functions

[sebbader]

As stated e.g. in admin-shell-io/java-model#13, the creation process of AAS entities is still pretty cumbersome. We may can add more convenience functions into dataformat-core. Please make proposals.

[FrankSchnicke]

From my perspective, the following features would be great:

• A Submodel does only allow retrieval of SubmodelElements as List. It would be beneficial to enable retrieval by IdShort (and semanticId?).
• Automatic reference resolution on an AASEnvironment, i.e.., providing a Reference and returning the referenced Referable (if included in the AASEnvironment).

[FrankSchnicke]

A further topic I see as import is a sensible toString() method for the metamodel elements

[mjacoby]

• Create Reference from Referable
• Parse Reference from String
• Get Parent of Referable (optional)
• Deep cloning of elements (optional)

[twebermartins]

see also #171

[FrankSchnicke]

As discussed in the last PL/committer meeting, I will close this issue and create separate issues for the points for better traceability.

The following points were addressed in the meantime:

• Create Reference from Referable
• Parse Reference from String
• Automatic reference resolution on an AASEnvironment, i.e.., providing a Reference and returning the referenced Referable (if included in the AASEnvironment).
• Sensible toString() method

The following points have their own issues:

• Deep cloning of elements (optional): [Feature] Copy constructor in base classes #85
• Get Parent of Referable (optional): Get Parent of Referable #213