They are now distinct classes with distinct responsibilities.
* ProfilePatch is an entry in MinecraftProfile and can hold VersionFile or Meta::Version.
* VersionFile is the basic element that holds version information loaded from JSON.
* Meta::Version is the loader class for VersionFile(s) from a server.
Any libraries stored in $instanceroot/libraries/ will override
the libraries from MultiMC's global folders, as long as they are marked 'local'
in the json patch.
