General ElectroBSD features

- Installer (cloudiatr) works with 512 MB RAM (and less)
- More reliable booting from ZFS root pools on USB
- ZFS deadlocks fixed or worked around
- MAC address randomization
- ggatec/ggated "hardened" (privsep, jail, capsicum)
- Socks support for ggatec
- Minor DTrace issues fixed
- Improved ZFS performance on memory-constrained systems (WIP)
   (https://www.fabiankeil.de/gehacktes/electrobsd/zfs-arc-tuning/)