[Infra] System Contract Dictionary (Candidate 1)

[quantumagi]

Note that this approach requires additional permission management for initiators. The code is substantially lengthier when compare to #490.

Example Authorization:

- Submitter calls the "UpdateWhiteList" method on the "Dictionary" contract. The request is recorded and an identifier returned:
  - E.g. "WhiteListUpdate(CodeHash:123,Whitelisted:true,Nonce:0)"
- Each signatory calls an "ApproveWhiteListUpdate" method with the identifier returned by the "UpdateWhiteList" method.
- Once the required approvals had been presented the "WhiteListUpdate" action is performed.
  (The process can be cancelled at any time by the original submitter using the "CancelWhiteListUpdate" method.)
- The contract is now successfully white-listed and can now be deployed.
- Following contract deployment a contract address will be available. 
- This process is repeated, using the "UpdateDictionary" method to associate a name (e.g. "Multisig") with the contract address.
- Now all nodes that rely on the information from the "Multisig" contract will be able to locate the new contract.

[quantumagi]

Closed due to lack of interest in this alterntive.