Added native handles to OpenGl_Context
Removed unused and unimplemented PolygonHoles
Removed unimplemented Polygon functions
Removed unused QuadrangleMesh functions
Removed unused TriangleMesh functions
Removed dead Bezier function declarations
Redirect Graphic3d_Group::Polyline() to primitives array
Move Prs3d_ShadedShape template code to StdPrs_ShadedShape
where it is only used before.
Remove TriangleSet usage from AIS_TexturedShape
Texture coordinates functionality added StdPrs_ShadedShape
to eliminate code duplication.
Eliminated usage of TriangleSet from QABugs_PresentableObject
Eliminated usage of TriangleMesh from StdPrs_ShadedSurface
Removed TriangleMesh and TriangleSet support
OpenGl_PrimitiveArray - render Edges only for primitives > GL_LINE_STRIP
Added vgrid command to show grid in 3D Viewer
Extend OpenGl_Context to provide GL2.0 core functionality
Added 'glext.h' header provided by Khronos group with definitions
and GL functions' types.
Added OpenGl_GlCoreXX structures with function list
to appropriate GL core functionality.
Fixed memory leak in OpenGl_Context destructor.
Eliminate inclusions of gl.h header
Use OpenGl_GlCore11.hxx instead.
Removed obsolote M_PI redefinitions.
Slightly cleaned up included headers.
Reuse definitions from glext.h
OpenGl_ArbVBO and OpenGl_ExtFBO originally provide own definitions
for OpenGL extensions.
