Add mandoc

[TheRealKeto]

This PR adds mandoc, which was sitting somewhere in one of Rolex's old, outdated PRs. New commits attempt to adapt the package to breaking changes.

Checklist

• [x] Have you made sure there aren't any other open Pull Requests for the same update/change?
• [ ] This Pull Request doesn't contain any package additions; it's a small change (e.g README change)
• [x] Have you confirmed this builds & works as intended on an iOS device (if applicable)?
• [x] Have you confirmed this builds & works as intended on a macOS device (if applicable)?