Switched to Miniconda and added cqparts to Dockerfile.

[jmwright]

@dcowden This does technically work, but treat it as a WIP until I get a more real-world test done. I'm making these changes to support the STEMN work, and so a mock setup of doing a conversion will probably be the test. I'm guessing there will be issues due to the CQGI show_object and cqparts display differences though.

This change adds cqparts and it's sub-libraries to the Dockerfile since cqparts is becoming such a crucial part of the CadQuery ecosystem. I also switched to Miniconda, which dropped the image size from 4.09GB to 1.74GB.

@fragmuffin @adam-urbanczyk This might be something you will at least want to be aware of too.

[AppVeyorBot]

✅ Build cadquery 1.0.50 completed (commit 56f345c2a1 by @jmwright)

[coveralls]

Coverage remained the same at 92.252% when pulling 4a9fb59 on docker into 0e1002e on master.

[dcowden]

@jmwright awesome stuff!

[jmwright]

Ok, this does work with cqparts scripts, but the catch is that the user has to call show_object(body.local_obj) for now. That's not a problem for me, but hopefully when CQGI is modified per recent discussions we can converge the display methods.

If there are no objections, @dcowden or someone else can merge. Otherwise I'll probably wait until later in the day tomorrow (UTC-5) to give time for comment and then merge it myself.

[dcowden]

Looks good to me.