Clean profiles

[andrewheumann]

BACKGROUND:

• When editing profiles via overrides in the Hypar web UI, certain configurations result in "illegal" topologies, like infinitely thin triangles, which break the editor. Some examples of these configurations are:
  • adjacent profiles that are nearly-but-not-quite aligned
  • profiles where one adjacent edge has an intermediate vertex but the other does not
• This is avoided by providing a "clean" set of profiles.

DESCRIPTION:

• Adds a static Profile.Cleaned extension method which cleans up a set of profiles into a clean graph which can be edited.

TESTING:

• I added several tests for the method which passed
• I have also been utilizing this method in production in a real hypar function, with good success. I am moving it to elements because I have another function that needs it.

FUTURE WORK:

• the Hypar web UI should become more resilient to bad geometry input.

REQUIRED:

• All changes are up to date in CHANGELOG.md.

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This change is 

[cdriesler]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! 1 of 1 approvals obtained