Multiple background images displaying each on a different axis. Changes made from the original patch. - Use an enum rather then multiple booleans. - Reduced the space taken up by the user interface. - Made the image template compact display not show fields & premul options. - Added readfile.c lines so old blendfile images are loaded. - Option to hide BGpic UI (like modifiers & constraints) - Use the index rather then a bgpic from the context for the remove operator. note: could be good to use 1 image for both left+right, for eg, but for this to work as intended we would need to add image flipping depending on the axis so left this commented out for now.