Switch to BigWigs packager and GitHub actions.

• CI
  • Disable Travis CI
  • Remove .travis.yaml.
• Packager
  • Remove Webhooks
  • Disable Curse Packager
  • Add .pkgmeta-classic
  • Add manual-lint.yml, pre-release and release.yml Files
• ToC
  • Add Conditional Interface Version

Closed @ f206aac.