Added Mesh support.  Performance improvments. Added music.

Added 3D Mesh support.
Designed 3D supsystem basic API.
Added color constants.
Improved update routine realisation.
Fixed minor bugs.
Corrected syntax mistakes.
Added method to force frame redraw from update routine.
Improved performance of 2D batching.
Added music realisation via SoundSample.
Minor const safe code improvments.
Slightly mesh code cleanup.
Added mesh rendering in 2D.

Fixed bug with 2D camera setup.
Close #85
Close #54
Renamed a lot of stuff. Added 3D basic dummies.

Added 3DIn2D example.
Fixed major bug in core renderer.
To IRender2D added methods to convert coordinates from Scrren to Camera
and revert.
Improved mesh rendering speed for 2D.
Added model exporter for 3ds Max.