* 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 c350c81e49.
* 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.
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