APWine SDK v0.2.1 beta

• added function useSigner and useProvider
  These will reinstantiate the following contracts:
  -- sdk.Registry
  -- sdk.AmmRegistry
  -- sdk.Router
  -- sdk.Controller

By default the provider will be used, since
if the instance is used for just fetching, it's better, because the sdk automatically wraps it into a MulticallProvider.

BulletPoints

• added needsApproval check in the approve function
• fixed a problem where the Controller would always be instantiated with a provider
• fixed getTokencontract casing
• fixed autoApprove not approving for the correct tokenAddress
• renamed apwibt to pt
• fixed a bug with fetchAMM getting the registry address instead of the router address.
• updated amm abi
• also added reexports of all types from amm and protocol