Updated to GitHub Actions

[eslutz]

Description

Removed AppVeyor config and added GitHub Actions workflows.

Type of change: 1

1. Non-functional change (e.g. documentation changes, removing unused using directives, renaming local variables, etc)
2. Bug fix (non-breaking change that fixes an issue)
3. New feature (non-breaking change that adds functionality)
4. Breaking change (fix or feature that could cause existing functionality to not work as expected)

Checklist:

• Have you reviewed your own code? Do you understand every change?
• Are you following the contributing guidelines?
• Have you added tests that prove your fix is effective or that this feature works?
• New and existing unit tests pass locally with these changes?
• Have you made corresponding changes to the documentation?
• Will this change require an update to an example project? (if so, create an issue and link to it)

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^{Reviewer guidelines}

[NeilSchiefer]

Sure, you complete this after I manually make a release this morning.:)

[eslutz]

Sure, you complete this after I manually make a release this morning.:)

Hey, at least it will be ready for when you make a full release 😆