0024389: Invalid hilight of AIS dimension line in local selection

- Fixed invalid presentation of dimension highlight.
- Fixed bug on switching between selection modes. Individual sensitive entities generated for each selection mode.
- Revised selection: AIS_DimensionSelectionMode enumeration added, redundant AIS_DimensionDisplayMode is removed.
- Revised entity owner usage: used standard SelectMgr_EntityOwner for neutral selection, AIS_DimensionOwner for "line", "text" selection modes.
- Made arrows selectable.
- Got rid of predefined arrow angle. The arrow angle is now taken from dimension aspect.
- The 3D text is now centered by bounding box for better alignment.

src/Prs3d/Prs3d_DimensionAspect.cxx

@@ -48,6 +48,7 @@ Prs3d_DimensionAspect::Prs3d_DimensionAspect()
   myTextAspect->SetVerticalJustification (Graphic3d_VTA_CENTER);
   myArrowAspect = new Prs3d_ArrowAspect;
   myArrowAspect->SetColor (Quantity_NOC_LAWNGREEN);
+  myArrowAspect->SetAngle (M_PI * 20.0 / 180.0);
   myArrowAspect->SetLength (6.0);
   myExtensionSize = 6.0;
 }