Decrease number of dependencies needed to parse STL files

[Harvie]

When i want to slice PLY i use examples.ply, but for STL there's quite large number of dependencies. This means that meshcut will drag these dependecies to any project which will use it. Maybe we can write some minimalistic STL processor to do the same job.

[julienr]

If I remember correctly, the stl parser uses numpy-stl which depends on numpy and a library called python-utils.

numpy itself is a dependency of meshcut, so we could just get rid of the python-utils dependency. Is that what you mean ?

I'm not sure how easy STL is to parse, I haven't really looked into the details of the file format.

[Harvie]

STL seems to be pretty simple format http://www.fabbers.com/tech/STL_Format