#21: Prepare by using std::vector for managing fogs and point shadows.
Make a common base class.
Fix potential bug in BlenderModel with overloaded identifier 'i'.
#21: Define 3 different colored lights.
Add pictures for construction blocks for red, green and blue light.
Define the attributes for the red, green and blue lights.
#21: Extend the AddPointShadow with more drawing modes.
#21: Make a new vector for special objects, not specialized for any specific object.
#21: Collect all colored light sources in one buffer, gLightSources.
#21: Implement drawing of colored lights.
Allow test player (--testuser) to see all construction blocks.
#21: Fine tune colored lights
They will not blend, but multiply with a color offset.