0024310: TKOpenGl - GLSL compatibility issues

Lights defintion clean up:
- remove duplicated enumeration TLightType (equals to Visual3d_TypeOfLightSource)
- remove unused fields from Graphic3d_CLight
- OpenGl_Light, reuse Graphic3d_CLight definition

Phong GLSL program:
- move out cumulative ambient light intencity from limited list of lights
- compatibility issues, replace array of structures (light sources, materials, clipping planes) with arrays of primitive types

New Draw Harness command vlight to alter light sources definition.

OpenGl_ShaderProgram::Initialize() - add missing Linker log

src/NCollection/NCollection_Vec4.hxx

@@ -215,6 +215,12 @@ public:
     return aSumm += theRight;
   }
 
+  //! Unary -.
+  NCollection_Vec4 operator-() const
+  {
+    return NCollection_Vec4 (-x(), -y(), -z(), -w());
+  }
+
   //! Compute per-component subtraction.
   NCollection_Vec4& operator-= (const NCollection_Vec4& theDec)
   {