Copy/paste from #1161, but with checkboxes and slightly more granularity. These will likely become their own issues.

• Replace api methods with instances of a Method class, with a middleware like layer for formatting/normalizing/validating method input/output.

• Reduce middlewares to only those that make calls to the web3 api, moving the formatting middlewares to the Method input/output formatters.

• Separate async and sync execution pathway through RequestManagers -> middlewares -> providers.

  • Async Providers:
    • HTTPProvider
    • IPCProvider
    • WebsocketProvider
  • Async Versions of each Module
    • Eth,
    • Net
    • Version
    • Parity Personal
    • Parity Shh
    • Geth Admin
    • Geth Miner
    • Geth Personal
    • Geth Shh
    • Geth Tx Pool
    • Testing