Add grit_col_conv.vcxproj although the code still needs work to run on windows
Add grit_col_conv.vcxproj although the code still needs work to run on windows

sparkprime/grit-engine,sparkprime/grit-engine,grit-engine/grit-engine,sparkprime/grit-engine,grit-engine/grit-engine,grit-engine/grit-engine,grit-engine/grit-engine,sparkprime/grit-engine