Rethink: DNS + Firewall + VPN

Oct 26, 2022

Introducing a more private Rethink resolver, Max.
Mark IPv6 as experimental; switch to IPv4 by default.
New feature: Backup and restore app settings.
New feature: App lockdown mode.
New feature: Universal lockdown mode.
New feature: Apply firewall rules on port numbers.
New feature: Apply app firewall rules in batches.
Minor UI refresh.
Other memory and crash fixes.