Shrimp Shader Generator FLTK2 GUI (SVN)

-Update toggle selection on marquee when the box is not surrounding a previous area

Tweaked the brushed vector function and blocks, added a twist/rotation factor.

-Move marquee selection(draw box selection and drag selection by selected any selected block )

Added helper function to get a brushed anisotropy vector for brushed metal effects.

-UI of the marquee selection (Move Copy Paste Delete will come soon)

-UI of the marquee selection (Move Copy Paste Delete will come soon)

Tweaked wrapped diffuse block, added attenuation.

Added diffuse falloff block. Tweaked lafortune block, changed some defaults. Tweaked the shading model headers, added the new diffuse falloff function, and factored in nondiff and nonspec for the outputs, since besides an on/off switch, they can be a scaling factor for light intensity.

NEW: console output example

Added Luke Emrose's implementation of Neulander & Van de Panne occlusion. (Note: need primitive variables, implement primitive variable blocks later & tweak AOVs).