- Add TODO to change interface of IAnnotationValueProvider::getContextMenuEntries(): The method should be based on another method in IAnnotationValueProvider that returns a <String, BiConsumer> whose BiConsumer defines the action to apply to a single annotation entry. This ensures uniform iteration over the affected annotation entries, while providing the flexibility to enable custom iteration schemes
- Minor cleanup
  - Perform all modifications of an action in a single command
  - Re-update of annotation view only it was enabled before issuing the command 
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- Extend the IAnnotationValueProvider interface to include a method that returns a list of context menu entries with associated actions. The default implementation returns an empty list (implemented in the default interface method). This allows existing annotation value providers to add some default context menu actions by implementing an additional interface while existing AnnotationValueProviders do not need to be adjusted.
- Add an additional descriptor class "AnnotationInstSpec" that allows to uniquely identify the Annotation (& instanceKey) shown as columns in the annotation view. It has been abstracted from the class ColumnHandle.
- Add a method to the AnnotationLabelProvider that allows to query the Annotation for which it has been constructed.
- Extend the GenericAnnotationView to display a context menu for "annotation columns". The content of the context menu is specified by the AnnoationvalueProvider.
- Implement a context menu entry in the interface DefaultAnnotationContextActions that is implemented by the EnergyConsumptionValueProvider.
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- For reasons of consistency, and to avoid that "generated-src" directory is deleted by IDE dev tools' EcoreBuilder, start specification of directory for generated edit code with a '/' (just like the model, editor, and test code directories)
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- Add getSuccessorConnector() that for a given {@link IConnector}, returns the successor {@link IConnector} of a given {@code successorType}.

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Every service registration is now only accessible via static methods in ToolingKernel and ToolingKernelUI, respectively.
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KISS: ObjectAware2ServiceBase and ObjectAwareServiceBase now inherit from IIntrospectiveKernelService
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- Remove spurious blank lines

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