Removes contract code 19 contracts deployed by non-whitelisted deployers that don't hold any funds currently.

### decoded proposal
```
 system.setStorage (38 writes)
    ├── EVM.AccountCodes × 19 = 0x00 (STOP)
    └── EVM.AccountCodesMetadata × 19
        ├── size = 1
        └── hash = keccak256(0x00)```

call

Executed

Submitted

DecisionDepositPlaced

DecisionStarted

ConfirmStarted

Confirmed

whitelisted_caller

Sweep up  unsanctioned contracts code

root

referendum_canceller

referendum_killer

general_admin

treasurer

spender

tipper

omnipool_admin

economic_parameters

Origin able to dispatch a whitelisted call.

 Origin for spending very high amounts of HDX(<= 50M HDX) from the treasury as well as generally administering it.

Origin able to spend up to 2,222,222 HDX from the treasury at once.

Origin able to spend up to 50K HDX from the treasury at once.

Origin able to perform specific Omnipool-related actions.