ConvertToLDraw convert 3D models into LDraw pieces

[Hageta]

I use trimesh to load 3D models and the following file types should work:
*.stl  *.3mf *.obj *.off *.ply *.gltf *.glb *.xaml *.stp *.step *.dae
and these filetypes may work:
*.brep *.igs *.iges *.bdf *.msh *.inp *.diff *.mesh
The program should theoretically be able to load anything trimesh can load.

The filetypes I actually tested are: *.stl, *.3mf, *.obj, *.ply
I cannot garanty that all possible variations of these filetypes work.

One problem I have found is, that colour in 3mf files can not be loaded.
(There is an issue about it and I try to fix that in a future version)

I have added a section about filetypes in the readme.