Modernize & merge useful changes from other forks

[Jamesits]

Changes:

• Added configuration for GoLand, GitHub Actions and GitHub Codespaces
• Added Dockerfile
• Added launchd unit from @KexyBiscuit
• Refactor directory structure to meet the Golang project structure standard

[m13253]

This is so modern! I'll test it out and merge when I get home. Thanks!