Joris april updates

[joburger]

• Output nested printpoints

• Added reverse_open_paths argument to seams_align to control if the direction of open paths should be reversed or not. Defaults to False.

• Added reverse_open_paths argument to sort_paths_minimum_travel_time to control if the direction of open paths should be reversed or not. Defaults to False.

• Updates in the visualization of PrintPoints.

• Added seams_align(next_path) to the standard planar slicing routine.

• Added unify_path_orientation back into the standard planar slicing routine.

• Changed unify_path_orientation to only work for closed paths.

What type of change is this?

• [X] Bug fix in a backwards-compatible manner.
• [X] New feature in a backwards-compatible manner.
• [ ] 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).
• [ ] I ran all tests on my computer and it's all green (i.e. invoke test).
• [ ] I ran lint on my computer and there are no errors (i.e. invoke lint).
• [ ] 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.
• [ ] I have added necessary documentation (if appropriate)