0026886: Visualization, TKV3d - eliminate global variables

- AIS_InteractiveContext - create new dummy class field to have an empty TopoDS_Shape object.
- AIS_Point, PrsMgr_PresentableObject - rename static variables to local function variables.
- AIS_Shape, SelectMgr_SelectableObject - remove unused static variables.
- Graphic3d_MaterialAspect, V3d_Viewer - make global static variables as constant.
- V3d_View - move global variable zRotation to class field.
- Move a variable theCurrentSelection as a field of AIS_InteractiveContext and AIS_LocalContext classes. Multiple selection is not used now, so each Context have an own selection.
- Move myStructGenId from Graphic3d_StructureManager to Graphic3d_GraphicDriver for identifying the structures in the driver.
- Move default variable (no shading light) from static value to the class field of OpenGL_View.
Porting note:
- Static methods of AIS_Selection is not used now. Methods of
  AIS_InteractiveContext::InitSelected(),::MoreSelected(),::NextSelected()
  should be used instead of static methods of AIS_Selection.

src/AIS/AIS_Shape.cxx

@@ -70,8 +70,6 @@
 
 IMPLEMENT_STANDARD_RTTIEXT(AIS_Shape,AIS_InteractiveObject)
 
-static Standard_Boolean myFirstCompute;
-
 static Standard_Boolean IsInList(const TColStd_ListOfInteger& LL, const Standard_Integer aMode)
 {
   TColStd_ListIteratorOfListOfInteger It(LL);
@@ -92,7 +90,6 @@ AIS_InteractiveObject(PrsMgr_TOP_ProjectorDependant),
 myInitAng(0.)
 {
   Set (shap);
-  myFirstCompute = Standard_True;
   SetHilightMode(0);
   myDrawer->SetShadingAspectGlobal(Standard_False);
 }
@@ -398,8 +395,7 @@ void AIS_Shape::ComputeSelection(const Handle(SelectMgr_Selection)& aSelection,
       return;
   }
 
-  static TopAbs_ShapeEnum TypOfSel;
-  TypOfSel = AIS_Shape::SelectionType(aMode);
+  TopAbs_ShapeEnum TypOfSel = AIS_Shape::SelectionType(aMode);
   TopoDS_Shape shape = myshape;
 
 // POP protection against crash in low layers