Add /orig/*_6502.js from https://github.com/trebonian/visual6502.git commit d8ecc129...

Add /orig/*_6502.js from https://github.com/trebonian/visual6502.git commit d8ecc129, add scripts to regenerate the layer images from polygons, add preliminary analysis in /6502 -- it has some problems -- no pads layer, no depletion transistors yet (we don't have polygons for their channels), many missed connections (such as when a via is not automatically generated because it falls within a transistor bounding box) -- need to do a comprehensive comparison of the netlists