Adding plate to surface model

[obucklin]

This PR adds plate elements to the SurfaceModel. This required a bit of refactoring, so there may be some bugs which pop up.

What type of change is this?

• Bug fix in a backwards-compatible manner.
• 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).
• 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_timber.datastructures.Beam.
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation (if appropriate)

[jonashaldemann]

Nice feature!

Generally works, but I have some issues with this surface at the door:

If I bake the geometry, it looks fine:

Generally the question: Should the Baking Component be updated and how will we control the Texture Mapping there?

[jonashaldemann]

Baking is solved with another PR, maybe add the Grasshopper Preview Glitch to the To Do list and then merge it.