0024623: Visualization - improve selection mechanism

Redesign of selection mechanism:
- implemented 3-level BVH tree for selection;
- selection now calculates in 3D space;
- intersection tests were moved to SelectMgr_BaseFrustum descendants;
- removed .cdl files in Select3D and .cdl related to selection in MeshVS;
- SelectMgr_ViewerSelectors are now shared between local and global contexts;
- transformations of sensitive entities are now stored in SelectMgr_SelectableObject only. Sensitive entities are independent from transformations, it is applied to SelectMgr_SelectingVolumeManager instance only;
- connected and multiple connected interactive objects are now represented by their child objects only for SelectMgr_SelectionManager;
- if interactive object has child objects, they will be stored as separate objects in SelectMgr_SelectionManager now.
- test cases bugs/vis/bug24623_1, bug24623_2, bug24623_3, bug24623_4 to test performance and memory issues.

src/ViewerTest/ViewerTest_RelationCommands.cxx

@@ -52,7 +52,6 @@
 #include <IntAna_IntConicQuad.hxx>
 #include <IntAna_Quadric.hxx>
 #include <Precision.hxx>
-#include <Select3D_Projector.hxx>
 #include <StdSelect.hxx>
 #include <TCollection_AsciiString.hxx>
 #include <TCollection_ExtendedString.hxx>
@@ -90,8 +89,6 @@ extern Handle(AIS_InteractiveContext)& TheAISContext ();
 static gp_Pnt Get3DPointAtMousePosition()
 {
   Handle(V3d_View) aView = ViewerTest::CurrentView();
-  static Select3D_Projector aProjector;
-  aProjector.SetView (aView);
 
   Standard_Real xv,yv,zv;
   aView->Proj (xv,yv,zv);