Support better input / output formats.

[julialongtin]

step input, bspline output please

[julialongtin]

talk to sensille about how to format and stream bsplines for printing.

[julialongtin]

@sensille <-- this person. :)

[fisx]

do you have links to the format specs, and to the hslice parts i need to touch?

[julialongtin]

This is going to be algorithmically challenging. the first one we want is 3df, and the second is STEP.

[fisx]

this one? or probably this one, more specifically? but i can't find anything about file format specs. can you flesh this out a little more?

also... why? docs are 20% about how to handle license keys. it's windows only. must be really good at something, then?

[julialongtin]

https://en.wikipedia.org/wiki/ISO_10303-21 <-- step format.