Rewrite privilage token middleware to be more efficent and use big.Int

[KevinJoiner]

Refactor the privilege token middle ware because I was in there to fix big.Int and some other parts bothered me

1. Update token_id to be big.Int instead of string
2. Add a function for that requires all privileges to be met not just one of
3. Move Contract Address to middleware constructor
4. Remove wrapping interface
5. Remove double token unmarshal.
6. Remove some of the random classes from test

[elffjs]

note: On the face of it, this is not backwards-compatible and probably dangerous in JS environments.

On the other hand we don't have any JS code that reads this right now and the tokens don't last very long. But we'd want to roll out upgrades to all affected services fairly quickly. (Or support both formats somehow).

[elffjs]

But this is not necessarily a vehicle.