Update everything to latest

[hildjj]

• Update dependencies
• Tweak build process so that it runs with current-version dependencies
• Update to support latest Commander version
• Create a Peggy-based grammar
• Update to the latest test suite
• Passes 100% of test suite tests on Linux, Mac, and Windows
• Move from Travis (hasn't worked in a year) to GitHub Actions
• Test on node 12,14,16,18, on all supported platforms
• Manual tests pass on node 8 Linux, but build-time dependencies no longer support pre-node 12, so added engines to package.json for the tested versions only

[hildjj]

I'm assuming based on the lack of action on this repo that it may not be maintained anymore. I've dropped my latest changes in here in case anyone wants them. However, I'll be maintaining a fork at https://github.com/cto-af/editorconfig-core-js if anyone wants to help. I'll kill that fork as soon as this project looks maintained.

I've sent a note to the mailing list as well.

[hildjj]

This PR is overcome by events. A new one will be coming using one-ini as the parser.