Assembly from Surface with components

[obucklin]

This adds the new funtionality to create a Timber Assembly from a planar rhino surface. Follows the US style for light framing.

• Moved the workflow module from compas_timber.ghpython to a new compas_timber.design package so that joint rules etc. can be used outside Rhino.

What type of change is this?

• 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.

• I added a line to the CHANGELOG.md 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).
• I added new functions/classes and made them available on a second-level import, e.g. compas_timber.datastructures.Beam.
• I have added tests that prove my fix is effective or that my feature works.
• [ x ] I have added necessary documentation (if appropriate)

[chenkasirer]

I think this is super cool.

• We could look at this like a reference implementation and think about how this can be turned into a nice API for other people (companies) to define their own logic by which an assembly is made from a surface, without them having to meddle in the inner workings of the library. Another layer of abstraction essentially, somewhere between the GH logic and the core library.
• For now maybe we can move it to a new package factories or something like that..
• we should sit together and try to figure out:
  • what are the inputs and outputs (e.g. geometry -> rules)
  • what can be made into a re-usable component

[obucklin]

I approve. but I cant approve my own PR, even if you have modified

[chenkasirer]

LGTO!
(Looks Good to @obucklin ;)