0027793: Visualization - object drifts at zoom within Graphic3d_TMF_TriedronPers applied

Graphic3d_TransformPers now takes Graphic3d_Camera definition as argument
for methods applying transformation.

Graphic3d_TransformPers::Apply() now computes Graphic3d_TMF_TriedronPers
transformation in the following way:
- The object is moved onto Z focus distance.
- The object is expected to be defined in pixels.
- The Z coordinate on anchor point is used as offset from the view corner in pixels.
- It is now possible to define not only corners of the view, but also middle of the side.
- Graphic3d_TMF_TriedronPers now works with perspective projection.

OpenGl_LayerList::ChangeLayer() - fixed removing of the element in old ZLayer.

OpenGl_Layer::BoundingBox() now takes into account bounding box
of Graphic3d_TMF_TriedronPers presentations for Z-fit operation.

dox/dev_guides/upgrade/upgrade.md

@@ -1031,6 +1031,12 @@ Applications should explicitly enable deprecated functionality by setting OpenGl
 but being aware that this functionality is likely to be removed in a next OCCT release.
 Thus the recommended way to generate vector image of a 3D model or scene is to use application-level solution independent from OpenGL.
 
+@subsection upgrade_710_trsfpers Transformation persistence
+
+The behavior of transformation persistence flags Graphic3d_TMF_ZoomPers and Graphic3d_TMF_TriedronPers have been changed to be consistent with textured fixed-size 2D text.
+Object with these flags is considered to be defined in pixel units, and presentation is no more scaled depending on view height.
+Applications that need to scale such objects depending on viewport size should update them manually.
+
 @subsection upgrade_710_removed Removed features
 
 The following obsolete features have been removed: