* Add missing WAN IPv6 properties to network resource
* Rename 'ipv6_static_subnet' to 'ipv6_subnet'
According to the go-unifi lib, the name was incorrect
* Improve description and validation of IPv6 properties
* Add missing IPv6 props to network
* Add IPv6 support to firewall rules
* Adjust naming
* ensure unique vlan
* Add vlan ID validation
* fix assertion
* Update docs
* rename attribute
* cleanup imports
* test protocol_v6
* test dhcp_v6_lease
* spelling
* switch protocol back
Co-authored-by: Paul Tyng <paul@paultyng.net>
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