- Move label provider to dedicated package
  - Move generic annotation view to dedicated package
  - Move inner classes of GenericAnnotationView to separate classes (filter support in dedicated package)
- Small documentation updates
- No functional change
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- Performance optimization: Prevent reconstruction of identical column set (e.g., when only the selection or a value in the model is changed)
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 - Cache annotation entries the different root elements. The cache for a given root element is invalidated when model elements are added to / removed from the structure beneath it.
 - Avoid superfluous updates:
   - Re-selection of a model element
   - ADD events for annotation objects. These are a caused by the addition of a model element which already triggers an ADD event.
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Extends the Derived annotation, such that element-specfic values can be returned; Useful for aggregate annotations.
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- Fix bug that icon faking the native widget is not hidden when the actual widget is shown for editing
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refs 2067

- Remove NOP override of setAnnotationValue()
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refs 2154

- Adds support for checkboxes in the TableViewer (of the annotations). Still needs visual improvements.
- Modifies the GenericAnnotationView to support the checkbox-editing. 

- Ensure that currently selected model element is visible in table view (the change of the selection can be triggered in an external editor, e.g. the model navigator)
refs 1841,2137

- getValues(): cache AnnotationEntry list returned for given model element, significantly improving the performance of the AnnotationView for larger model. The view makes extensive use of this method from its update() method.
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- Change semantics of SUB_MODEL scope declaration to also include the element to which the annotation is attached
- Preserve the current behavior (current element is not included) in STRICT_SUB_MODEL
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- Cache column width (possibly manually adjusted by the user)
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  - Broken after integration of EReference support since setting of values no longer defaults to String initializers)
  - Hence, also override doSetValue(AnnotationEntry, Object).
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  - Contained features are created automatically by the generated EFactory
  - Non-contained features must be set by the user
-> Return null in any case
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 - Rename computeFullyName() -> computeFullyQualifiedName()

 - Extend EStructuralFeatureValueProvider and ComboBoxEditingSupport to handle also this case
 - Reintroduce EStructuralFeatureDescriptor to provide means to specify the scope in which EReferences can be set
     - PROJECT: All models in the current project
     - MODEL: Current model (e.g., ComponentArchitecture)
     - SUB_MODEL: Sub-model below the model element that hosts the annotation managed by the current IAnnotationValueProvider
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- Add constructor to DerivedAnnotationValueProviderBase that eases to build "mixed" annotations, i.e. those that provide one derived / calculated value, and one or more values backed by EStructuralFeatures
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- If there is only one EStructuralFeature in the annotation's EClass, registered it with the DEFAULT_KEY
- This results in a more readable column heading (which is exactly the String returned by the user-supplied implementation of getAnnotationName(), instead of "<user-supplied String> : <EStructuralFeature name>"
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- Unify (merge) MultiInstanceAnnotationSupport with (into) TextEditingSupport
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- Add color code for uneditable annotations values
  - light gray: annotation does not exist for the given model elemnt
  - light blue: annotation is a derived / computed value
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  Simply label it "Model Element"
- Likewise, in component filter, use "model element" instead of "component" as filter label
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