Add transparent blocks (map ID 0) as a color category to enable support for PNGs. #318
Description
Items such as air, torches, redstone wire, glass, and glass pane show up as transparent on maps. Currently (at least from what I am able to tell) when you upload a png it will give it a background made of color_black with no way to change it. If this could be added that would be great, or if there is already a way to get the background to be made of transparent blocks and I am just being dumb, if I could be informed that would also be great. Thank you.