Changes
/* Beta 3.0.17.4 (2019-03-XX) */
* Clipboard now supports Drag&Drop operations
* The SelectiveList editor's ''Value'' column is now a target for Picker item drop operations, e.g. for building lists of type Guid
* The BulkEditor now allows to convert a MetaClass into a new query, by dropping a property from the InstanceEditor
** The new query is opened in a new BulkEditor and the dropped property results in an initial QueryItem
** Adding and removing QueryItems is now an undoable action
* ProjectView and EnvironmentView now have icons to distinguish them from other worksheets
