Add foundation::is_zero(foundation::Color<>)
Add foundation::is_zero(foundation::Color<>)

docwhite/appleseed,dictoon/appleseed,glebmish/appleseed,dictoon/appleseed,glebmish/appleseed,luisbarrancos/appleseed,docwhite/appleseed,gospodnetic/appleseed,glebmish/appleseed,docwhite/appleseed,aiivashchenko/appleseed,Aakash1312/appleseed,gospodnetic/appleseed,pjessesco/appleseed,pjessesco/appleseed,Biart95/appleseed,Vertexwahn/appleseed,aytekaman/appleseed,docwhite/appleseed,Aakash1312/appleseed,docwhite/appleseed,aiivashchenko/appleseed,Aakash1312/appleseed,Biart95/appleseed,gospodnetic/appleseed,aytekaman/appleseed,aytekaman/appleseed,pjessesco/appleseed,est77/appleseed,aiivashchenko/appleseed,appleseedhq/appleseed,appleseedhq/appleseed,Biart95/appleseed,luisbarrancos/appleseed,appleseedhq/appleseed,Vertexwahn/appleseed,luisbarrancos/appleseed,dictoon/appleseed,luisbarrancos/appleseed,Vertexwahn/appleseed,gospodnetic/appleseed,gospodnetic/appleseed,Biart95/appleseed,Biart95/appleseed,appleseedhq/appleseed,Aakash1312/appleseed,dictoon/appleseed,est77/appleseed,glebmish/appleseed,appleseedhq/appleseed,Aakash1312/appleseed,pjessesco/appleseed,est77/appleseed,dictoon/appleseed,est77/appleseed,pjessesco/appleseed,luisbarrancos/appleseed,aiivashchenko/appleseed,glebmish/appleseed,aiivashchenko/appleseed,aytekaman/appleseed,Vertexwahn/appleseed,Vertexwahn/appleseed,est77/appleseed,aytekaman/appleseed