Implement support for the 'map' directive in Tayga
that can be used to statically define one-to-one
maps between IPv4 and IPv6 prefixes.
Implements #4606.
* Convert TAYGA virtual interface to interface group
Allows nat64 interface assignment (required for adding custom routes).
* Add nat64 interface to tayga interface group
Required because TAYGA virtual interface was converted to interface group in c350c81e49a89b9d57d3a86355907910b589a098.
* Add TAYGA configuration item to disable IPv6 route
* Add TAYGA GUI option to disable IPv6 prefix route
Required for adding custom routes.
* Add variable for disabling TAYGA IPv6 route
Required for adding custom routes.
* Add IPv6 route disable switch to TAYGA rc.d
Required for adding custom routes.
* Update TAYGA plugin to version 1.2
New feature: Custom IPv6 Routing
* Update TAYGA plugin to version 1.2
New feature: Custom IPv6 Routing
* Configure routes after TAYGA start
Required for custom routes.