AIS_TextLabel - new public class to display simple text labels (based on MyTextClass private class from Draw Harness).
ViewerTest::Display() - add more reliable replacement for VDisplayAISObject() with no viewer update flag.
vdrawtext command redesign:
- Use new AIS_TextLabel class instead of private MyTextClass.
- Take object name and allow to clear labels from the Viewer.
- Use parameter name + parameter value syntax instead of strict list of mandatory arguments.
- Use [0; 1] range for colors and accept names.
- Drop redundant argument "isMultiByte".
- Support argument -noupdate to skip Viewer update.
Update test cases to new syntax of vdrawtext.
V3d_View::GetGraduatedTrihedron() - return configuration structure directly.
OpenGl_View::TriedronDisplay() - do not re-create trihedron on each Display call.
OpenGl_Trihedron::Setup() - eliminate global variables.
OpenGl_PrimitiveArray::buildVBO() - release old VBOs before initialization.
ViewerTest.hxx - move out package header from .cdl file.
ViewerTest::ParseColor() - add new method to parse color arguments in common way.
vzbufftrihedron - improve command syntax.
vgraduatedtrihedron - add options -drawgrid and -drawaxes.
