[Kernel] Provide generic keyboard shortcut facility
See in org.fortiss.af3.expression.ui.editor.DataDictionaryEditorGUI, the
private class
org.fortiss.af3.expression.ui.editor.DataDictionaryEditorGUI.ViewerKeyAdapter:
some key adapters are manually defined for the data dictionary in order
to provide the facility to have Ctrl-C, Ctrl-X, etc. working on the data
dictionary.
This would probably be useful in other places and could therefore
benefit from being in the kernel.
(from redmine: issue id 2284, created on 2015-02-04)