correctly outputs all polygon colors

Слиты nikitronn запросил слияние fcstd_materials в master

Created by: zeffii

might be useful for read fcstd node.

image freecad_utils_test_2022_06_19_15_31.zip

  • obj.polycolors: every polygon outputs a color, or if the list is len==1 then the whole object is one color.