Introduce color lib

[J005t67]

I started a color library for the following reasons.

• color names are more easy to read and remember than hardcoded colors
• color names are more easy to search for, especially when they contain both the functional name, (so yo can search for TramLine/TramLineDot etc) and a physical name (so you can search for Black/Blue etc.)
• currently the code contains about 1600 direct dependencies to opengl toolkit. (Search for 'GL.') For portability it is better to start moving all the colors to the colorlib.