feature: GitHub Actions test and build

[jbolda]

BACKGROUND:

• What led to this work, and what is the broader context of this change?
  Trying to help out! 👍

DESCRIPTION:

• What does this PR specifically accomplish?
  Supplementing Travis CI (and maybe eventually replacing?).

TESTING:

• How should a reviewer observe the behavior desired by this pull request?
  The checks below on pull request and in the Actions tab on pushes to master.

FUTURE WORK:

• Is there any future work needed or anticipated? Does this PR create any obvious technical debt?
  We have been discussing add package publishing to this pipeline, but more needs to be decided and hashed out before that happens.

COMMENTS:

• Any other notes.
  This will fail on Linux and Mac. There is an open issues, IFC export warnings are emitted during build in github action. #285 and Enable glsl shader material creation. #286, that may want to be resolved before merging, but I will leave that up to reviewers.

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This change is 

[jbolda]

Note that you will likely need to turn on Github Actions in the settings to see the build.

[ikeough]

Thanks very much for this @jbolda! We're getting a bunch of other PRs in for the 0.7.0 release currently, but I will review as soon as that is done.

[ikeough]

Reviewable status: 0 of 1 files reviewed, all discussions resolved (waiting on @ikeough)

[ikeough]

@jbolda Better late than never. We've actually moved on to support .net core 3.1. so we'll have to update from this side. Thanks very much for the contribution.