[webGLviewer] - Yet another WebGL viewer

[Jakub Trznadel]

All,

I've updated my webgl viewer. Bugfixes & enhancements include:
- proper color handling for lines and optlines,
- faster loading,
- support for steps,
- nicer interface:
-- buttons for ortho/perspective switch,
-- render options:
--- transparent wireframe,
--- wireframe,
--- full phong-shaded model,
--- full (phong+wireframe).
-- steps button: go to first/prev/next/last step.

At the moment all ldraw.org and ldcad models are rendered properly. Datsville models are available also, but probably rendering whole city will not be possible in current generation hardware.
_webglviewer-specific models (animated/nxt-style programming) does not support currently all render options, there are still todos.

All comments are welcome

Regards,
Jakub Trznadel

Screenshot: