Commented and cleaned up RenderBuffer class.
Added mixColors() method to renderbuffer class (better to have there in
a cpu-critical code like that).
Created dedicated RaceTrack class. Some cleanup inside it.
Renamed RenderBuffer to SoftwareRenderBuffer, moved to dedicated
package.
Re-organizing RaceTrack class.
Moved Parallax scroll classes to dedicated package inside Tetragon.
Continued RaceTrack class restructuring to make it a re-usable class
adhering to good OOP.