Drago: A decentralized coin mixer on CKB

[WilliamsBlock]

@Cipher

It takes almost the same operations as an ordinary withdrawal, the only difference appears in the data update process. It will clear the PK array and the key image array to reduce the burden of witness data size.

After all of amount of deposit are taken away by receiver, how to address the deposit cell?(doest it use since field to control the life cycle ?)