v1.6

This fix includes a couple fixes that have been piling up since v1.5:

• The script will now work on copies of the texture layer
• Some inexplicable resizing failures have been fixed
• Paths have been made properly cross-platform (@katp32)
• randomly generated 2x sizes are now properly 2x the normal size (@bojidar-bg, @beccabunny)

v1.5

added new option to rotate the gas layer