Shrimp Shader Generator FLTK2 GUI (SVN)

Updated lights header to remove environment light, and removed area light and environment light blocks. These some work, as well as matching rib updates. They'll be re-added later, when everything's working properly.

Updated lafortune block for typo (colormatrix type is float, _not_ color). Also updated anisotropic CookTorrance block for typo, and respective model declaration in shading models header.

Added anisotropic Cook-Torrance (Heidrich-Seidel distribution) block.

Updated shading models header, with anisotropic Cook-Torrance model (anisotropic Heidrich-Seidel microfacet distribution function, instead of standard model's Beckmann distribution).

Preference saving of front renderer and display choosers

added renderer code to the preference file

Misc updates

Automatic platform detection

Updated fractal.h to add different distance metrics to Voronoi patterns (Tchebychev, Minkowski), and updated Voronoi blocks to use new features.

OS X compatibility