Please add test-cases that fail the triangulation conversion

[nmz787-intel]

I am interested in trying different approaches to triangle generation, such as the code over here (https://github.com/s-holst/GDS2WebGL), to avoid the issues and segfaults the README and code-comments warns about. It would be nice to have the testcases that previously raised these issues for quick comparison. A README with descriptions of the failure and location in the output, in the testcase directory, would be sufficient for my needs I think.

[mbalestrini]

I don't have test cases right now.
I've been adapting the code from https://github.com/dteal/gdsiistl to generate STL, OBJ, and GLTFs, making some modifications, but never really made a deep analysis of the script.
I don't know if the segfaults are happening right now, at least with the TinyTapeout files that are being used.