Convert FreeNAS 12 to using single "MetaPort"
Currently my PoC FreeNAS MANIFEST hard-specifies the entire list of packages to install when creating FreeNAS. This needs to be changed to a single top-level Meta Port. This is done so that when we do updates via pkg-base, new ports will automatically be fetched as installed as dependencies of this meta-port. If we need to remove a package, we can also just drop them from the meta-port, and they will be deleted as apart of the 'pkg autoremove' routine during upgrades.
Example of TrueView Meta Port