0027860: Visualization - clean up Transformation Persistence API

0027860: Visualization - clean up Transformation Persistence API

Graphic3d_Camera::TransformMatrices redundant NCollection_Handle usage
has been replaced with validity flags.

Graphic3d_TransModeFlags now defined as enumeration, not integer bit flags.
Graphic3d_TMF_PanPers and Graphic3d_TMF_FullPers have been removed.
Graphic3d_TMF_ZoomRotatePers has been introduced.

Graphic3d_TransformPers is now inherits Standard_Transient.
Graphic3d_TransformPers now defines dedicated constructors
for 3D persistence (zoom / rotate) and 2D persistence (2d / trihedron).
2D persistence now supports dedicated values for X and Y offsets.
The corner is now specified by enumeration Aspect_TypeOfTriedronPosition
instead of indirect interpretation of anchor point values.
Fixed handling of Graphic3d_TMF_ZoomRotatePers (combination of Graphic3d_TMF_RotatePers + Graphic3d_TMF_ZoomPers).

PrsMgr_PresentableObject, Graphic3d_CStructure now hold
Handle(Graphic3d_TransformPers) instead of a value.
Method ::SetTransformPersistence(), ::TransformPersistence()
now works with Handle(Graphic3d_TransformPers).
Old methods have been marked deprecated.