- Fix some warnings

...notation/editingsupport/AnnotationEditingSupportBase.java

.../ui/annotation/editingsupport/ComboBoxEditingSupport.java

...e/ui/annotation/editingsupport/EditingSupportFactory.java

...i/annotation/editingsupport/MultiSelectionCellEditor.java

...notation/editingsupport/MultiSelectionEditingSupport.java

.../ui/annotation/labelprovider/AnnotationLabelProvider.java

...on/labelprovider/EmulatedNativeCheckBoxLabelProvider.java

.../tooling/base/ui/annotation/view/IAnnotationViewPart.java

...notation/view/generic/CreateAnnotationInstanceColumn.java

...ase/ui/annotation/view/generic/GenericAnnotationView.java

...e/ui/annotation/view/generic/filter/AnnotationFilter.java

...nnotation/view/generic/filter/AnnotationFilterWidget.java

...g/AbstractDecoratedTextCellDatabindingEditingSupport.java

...TextStyledTextActionHandlerDatabindingEditingSupport.java

...atabinding/AbstractTextCellDatabindingEditingSupport.java

.../src/org/fortiss/tooling/base/ui/dialog/ButtonDialog.java

.../tooling/base/ui/dialog/ElementTreeMultiSelectDialog.java

...tooling/base/ui/dialog/ElementTreeSingleSelectDialog.java

...ase/ui/dnd/jface/ViewerElementCompositionDropAdapter.java

...tiss/tooling/base/ui/editpart/ConnectionEditPartBase.java