chore(ci): kill appveyor with fire

[shellscape]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Description

This PR serves to test Circle CI's and Azure Pipelines' Windows test implementations. We'll choose the winner to keep around so we can kill AppVeyor with lots of fire. The goal here is to obtain faster windows builds and tests so PRs don't get held up in CI so long.

[codecov]

Codecov Report

Merging #3059 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3059   +/-   ##
=======================================
  Coverage   88.73%   88.73%           
=======================================
  Files         165      165           
  Lines        5735     5735           
  Branches     1748     1748           
=======================================
  Hits         5089     5089           
  Misses        388      388           
  Partials      258      258

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[shellscape]

Looks like I have the configuration right for Circle CI. Azure Pipelines is a maze of funky UX and docs, and I can't figure out how to get it to read the YAML file from this branch. Going to talk with someone at Circle about bumping our plan so we can run the Windows VM.

[lazka]

Azure Pipelines is a maze of funky UX and docs

yeah

, and I can't figure out how to get it to read the YAML file from this branch.

I think it only lets you create a build pipeline once you add a yaml to master.

[shellscape]

Closing in favor of #3078