* checks for existing staking account
* removed code for v2 migration
* using stronger types for storage keys
* Added type alias for the storage key and documented each `Map`
* remove the hacky way of storing staker information
* allow the staking address account to perform delegations with the additional msg argument
* new unit tests
* updated client code
* modified migrate msg to explicitly require confirming having performed manual checks
* re-ordered arguments
Jędrzej Stuczyński
2587d00b9e