camera movement
AutoZFit operation now may be applied on Visual3d_View level.
Visual3d_View tracks Graphic3d_Structure updates and call AutoZFit within
Visual3d_View::Redraw if necessary.
In order to get AutoZFit functionality on Visual3d_View level ZfitAll
method moved from V3d_View into Graphic3d_Camera. AutoZFit method and
AutoZFitMode flag now part of Visual3d_View.
Test case for issue CR24996