0027202: Visualization - add sensitivity Select3D_SensitivePrimitiveArray for Graphic3d_Buffer

New class Select3D_SensitivePrimitiveArray can be initialized directly from
presentation data structures Graphic3d_Buffer defining triangulation or point set.

This class also can combine several elements into patches
to reduce BVH initialization time in at the expense of slower detection time.

AIS_PointCloud::ComputeSelection() - selection is now computed on point set using Select3D_SensitivePrimitiveArray by default.
PrsMgr_PresentableObject::Compute() - redundant default argument value has been dropped.
BVH - store BVH_Set size in local variable to simplify debugging.

src/ViewerTest/ViewerTest.cxx

@@ -63,6 +63,7 @@
 #include <Prs3d_IsoAspect.hxx>
 #include <Prs3d_PointAspect.hxx>
 #include <Select3D_SensitiveWire.hxx>
+#include <Select3D_SensitivePrimitiveArray.hxx>
 #include <SelectMgr_EntityOwner.hxx>
 #include <StdSelect_BRepOwner.hxx>
 #include <StdSelect_ViewerSelector3d.hxx>
@@ -4508,6 +4509,14 @@ static Standard_Integer VState (Draw_Interpretor& theDI,
               << aSen->DynamicType()->Name()
               << "\n";
       }
+
+      Handle(Select3D_SensitivePrimitiveArray) aPrimArr = Handle(Select3D_SensitivePrimitiveArray)::DownCast (anEntity);
+      if (!aPrimArr.IsNull())
+      {
+        theDI << "                       Detected Element: "
+              << aPrimArr->LastDetectedElement()
+              << "\n";
+      }
     }
     return 0;
   }