Minor irqbalance update with various bugfixes:
- fixed affinity setting with fflush prior to close
- fixed the ui socket getting blocked for multiple seconds at a time
- Improved systemd hardening by dropping unneded privs
- avoid some repeated affinity checks
- silence some unneeded messages in logs
- filter console only output when running in journal mode
- enable systemd by default in meson build files
- Add man pages to meson build