cgroupify: Add optional cgroupify component
This component watches a systemd unit and moves all processes into separate cgroups. The intention is to do this for browsers, and a number of drop-in configurations are shipped for this purpose.
Configurations that should work are provided for:
- Epiphany (org.gnome.Epiphany)
- Chromium (chromium-browser)
- Firefox (firefox)
- Chrome (google-chrom)
Integration is provided for at least:
- GNOME
- KDE