Autoforge

This release has a new Heightmap initialization, using Christofides Algorithm to solve the initialization as a Traveling Salesman Problem. With this the initialization is no longer luminance based, but instead solves for the optimal path starting with the background. Now we are pretty much at the point where we can remove (or make optional) the hardcoded background and let the algorithm figure out the color combination by itself.

What's Changed
* Fix a couple little TensorBoard things by rparrett in https://github.com/hvoss-techfak/AutoForge/pull/22
* Add timeout to filament library fetching by rparrett in https://github.com/hvoss-techfak/AutoForge/pull/24
* Replace asserts with simple printed error messages by rparrett in https://github.com/hvoss-techfak/AutoForge/pull/23


**Full Changelog**: https://github.com/hvoss-techfak/AutoForge/compare/v1.5.2...V1.5.3

We are now down from 4-5 minutes to ~2 minutes for the main optimization loop on my system. With the new optimizer (I previously forgot to mention) we could also reduce the iterations by half in the next version, meaning the optimization could probably be done in under a minute now.

**Full Changelog**: https://github.com/hvoss-techfak/AutoForge/compare/v1.5.1...v1.5.2

This version gives a speed improvement for generating discretized images.
I also got some new filaments and added them to my printing list.
The colors should now look better when compared with actual prints.

**Full Changelog**: https://github.com/hvoss-techfak/AutoForge/compare/v1.5.0...v1.5.1

We had an error in the previous versions, where both layer swaps and the hueforge project would set all layer changes one layer lower than originally learned. The problem is honestly just a bad mistake, because if you have a background height of for example 0.4, then the first new layer should be 0.44 (using a layer height of 0.04) and not 0.4.

What's Changed
* Experimental changes ready for production by hvoss-techfak in https://github.com/hvoss-techfak/AutoForge/pull/19

**Full Changelog**: https://github.com/hvoss-techfak/AutoForge/compare/v1.4.2...v1.5.0

Now images with alpha masks work correctly.

**Full Changelog**: https://github.com/hvoss-techfak/AutoForge/compare/v1.4.1...v1.4.2

Added new parameter stl_output_size to limit the x and y size of the generated stl file.

**Full Changelog**: https://github.com/hvoss-techfak/AutoForge/compare/v1.4.0...v1.4.1