Add postprocessing step to structural weaver to update referenced elements

[Matthias Schoettle]

Steps to reproduce:

1. Create AspectA with Class A
2. Create AspectB with Class B
3. Extend AspectA
4. Create operation "+ A getA()" in Class B
5. Weave

Result:

The return type referring to A in the operation is not updated in the woven aspect, it points to A in AspectA. This can be observed by the validator (there is an error) and when saving the model.

Currently, existing elements are not updated. I think this requires an additional post-processing step to take care of it.

[Matthias Schoettle]

This should be done once issue #161 is resolved (improvements to ReferenceUpdater).

The following classes need to be updated:

• ClassifierMapping (to element could be from extended aspect)
• Operation (return type)
• Attribute (type)
• Parameter (type)

[Matthias Schoettle]

References issue #160: Added reference updating for parameter (type), operation (return type) and classifier mapping (to element).

→ <<cset 070564565279>>

[Matthias Schoettle]

References issue #160: Added reference updating for OperationMapping and ParameterMapping.

Fix for updating list of objects to be able to call it passing a list of any sub-class of EObject.

→ <<cset b22f90454eb5>>

[Matthias Schoettle]

References issue #160: Introcuded postprocessing operation to PostProcessor, which then internally performs the required postprocessing steps.

Added postprocessing step to update the references of the woven aspect (higher-level) using the ReferenceUpdater.

The updating of references in the updateInstantiationDeclaratives step (addressed in issue #58) is now handled by ReferenceUpdater in the second postprocessing step.

→ <<cset 97b5484b806f>>