Print organization bug fixes

[ioannaMitropoulou]

In this branch I did the following (also documented in the changelong)

Added:

• Added Iterators through printpoints in PrintOrganizer
• Added Iterative smoothing of attributes on printpoints (ex smooth velocities, orientations etc)
• Added Export of (jsonable) PrintPoint attributes to json (in previous versions they were ignored upon export)

Changed:

• added first layer in the slicing process that was previously removed.
• set_velocity function was split into separate functions depending on type (constant, by layer, by range, by overhang)

Fixed:

• Fixed bug on the calculation of the Printpoint frame (both on PrintOrganizer and on the gh visualization).

Removed:

• VerticalConnectivity from CurvedPrintOrganizer. This function does not need to be on its own class.
• Checking feasibility of Printpoints in PrintOrganizer (anyway it was a function left not-implemented in most PrintOrganizers). Might be re-introduced in the future but with more specific tasks.
• Planar slicing using MeshCut (and meshcut library from requirements).

What type of change is this?

• [ ] Bug fix in a backwards-compatible manner.
• [ ] New feature in a backwards-compatible manner.
• [X] Breaking change: bug fix or new feature that involve incompatible API changes.
• [ ] Other (e.g. doc update, configuration, etc)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [X] I added a line to the CHANGELOG.rst file in the Unreleased section under the most fitting heading (e.g. Added, Changed, Removed).
• [X] I ran all tests on my computer and it's all green (i.e. invoke test).
• [X] I ran lint on my computer and there are no errors (i.e. invoke lint).
• [X] I added new functions/classes and made them available on a second-level import, e.g. compas.datastructures.Mesh.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [X] I have added necessary documentation (if appropriate)

[ioannaMitropoulou]

Many changes! Generally looks good though! But maybe tomorrow in our meeting you can also take me through some of the changes you did? And I think we should also bump the version with this but we could also do it a next PR.

Sure let's do that! There's actually less changes than it looks, in some files I only mostly changed the indentation from

for layer_key in...
for path_key in ...
for ppt in...

to for ppt in printorganizer.printpoints_iterator

But then the change appears as if I have changed the entire file :/

I'll show you tomorrow what I did exactly