v2.1.0 Better filament limits & optimizations

Version 2.1.0 gives the cli and webUI a way to fix the amount of colors and swaps during the optimization process. This actually increases the quality of the prints by 15-20%, but takes roughly 30-50% more time to complete. Either way, Autoforge is now no longer reliant on post-pruning to reduce the amounts of colors and swaps.

I also added a height refinement and color stack search in the pruning process. This is by far the largest improvement of the last versions, as in many cases it improves the image quality by 2-3 times. Take a look at it, even images that looked pretty bad during the optimization improve drastically after the pruning itself.

I also worked a lot on gpu optimizations to offset the 30% increase in compute time. The algorithm should now be 60-80% faster and finishes an image without limits in 20-30 seconds on the gpu.

Full Changelog: v2.0.1...v2.1.0