Graphic3d_TypeOfShaderObject enumeration has been extended by Geometry shader object type.
OpenGl_ShaderProgram::Initialize() processes new shader object types when supported by OpenGL version.
Declarations.glsl has been fixed so that occFragColor is defined only for
Fragment Shader object only (by handling new FRAGMENT_SHADER macros).
Improved documentation of Graphic3d_ArrayOfPrimitives class.
vshader Draw Harness command has been extended to support definition
of Shader Object types other than Vertex and Fragment shader.
OpenGl_ShaderManager::stdComputeLighting() - handle single directional light specifically
for compatibility with broken OpenGL ES drivers.
Added test cases using built-in GLSL shading programs.
