Shrimp Shader Generator FLTK2 GUI (SVN)

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

Renderer/display choosers implementation: first step

reversed input removal

Added initial versions of light shader blocks, with shadow map support.
Area light and environment lights still need work. Updated RIB scenes, so that shaders affected the entire scene, and updated grid shader, to have a diffuse component, instead of constant.

support; separated storage and type in input edition dialog