0029674: Improvements in Inspector tool

- preferences for dock windows geometry, tree view columns and current view projection;
- ViewControl package for common functionality between plugins;
- processing Location and Orientation for external TopoDS_Shape object
- 'F5' key to update content of each plugin
- visibility column in tree view (used now only in ShapeView)
- properties child item for context (presents tree of current Filters of context)

tools/DFBrowserPane/DFBrowserPane_TDataStdTreeNodeModel.hxx

@@ -56,6 +56,11 @@ public:
   virtual int columnCount (const QModelIndex& theParent = QModelIndex()) const Standard_OVERRIDE
   { (void)theParent; return 1; }
 
+protected:
+  //! Creates root item
+  //! \param theColumnId index of a column
+  virtual void createRootItem (const int theColumnId) Standard_OVERRIDE;
+
 private:
 
   Handle(TDF_Attribute) myAttribute; //! the parent attribute