sysutils/whowatch: Update 1.4 => 1.8.6.2, take maintainership
Switch to upstream with FreeBSD support:
- The new update wasn't working on FreeBSD due to Linuxisms and FreeBSD wrong API usages.
- Overhauled the codebase in a fork and updated it to work on both Linux and FreeBSD.
- Uses of sysctl, libprocstat, kvm etc to gather the system informations.
PR: 293113
MFH: 2026Q1
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>