0025974: Visualization - fix misprints in method naming of Graphic3d_GraduatedTrihedron

0025974: Visualization - fix misprints in method naming of Graphic3d_GraduatedTrihedron

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.