Shrimp Shader Generator FLTK2 GUI (SVN)

-Fix a bug introduce in my last publish when deleting one node (shrimp crash)

Added project texture block, retrieves float or color opacity according to user method, color, projects texture, and fixes texture seams. Fixed texture header.

Moved bias, gain, gamma to Color section. Added color bias/gain/gamma in helpers header, as well as CIE luminance. Added initial Shrimp Texture header. Added block to allow grayscale conversion via user supplied methods, and block to retrieve number of texture channels.

-Add EDIT menu with : Group 'g' /Ungroup'u'/Edit block 'e'/Delete blocks 'Delete'

-Remove last shortcut hack it was a problem of fltk version
-Create shortcut for ungrouping node key 'u'
-Highlight border and tlltle of group
-Add selection color change for group

-Change the shortcut of edit block no more mouse double click instead key 'e'
-Make shortcut of CTRL+G and CTRL+A working(I try older version 178 and those shortcut wasnt working)
-Create shortcut for grouping node key 'g'

-Change the shortcut of edit block no more mouse double click instead key 'e'
-Make shortcut of CTRL+G and CTRL+A working(I try older version 178 and those shortcut wasnt working)

-Delete single and multi selection of node using Delete Key
-Double click on block = edit block (will be change when window parameter will be available)

Frikin typos, again - simple_AOV example scene was wouwoued, added __shadow as required, hope this is the last one i spot.

Updated AOV example and default distant light shader to use __shadow.