22316: EDF 2719 SMESH: Split hexas into prisms

22316: EDF 2719 SMESH: Split hexas into prisms

 namespace SMESH
 {
   enum SMESHGUI_FilterType {
     QuadFilter              =  5,
     TriaFilter              =  6,
+    FirstGeometryTypeFilter,
+    FirstEntityTypeFilter   = FirstGeometryTypeFilter + SMDSGeom_NONE,
+    LastFilter              = FirstEntityTypeFilter   + SMDSEntity_Last
   };
 };

+class SMESHGUI_VolumeShapeFilter : public SMESHGUI_Filter
+{