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This commit revamps the previous WalletController interface, edging it closer to a more complete version. Additionally, this commit also introduces two new interfaces: BlockchainIO, and Singer along with a new factor driver struct, the WalletDriver. This BlockChainIO abstracts read-only access to the blockchain, while the Singer interface abstracts the signing of inputs from the base wallet paving the way to hardware wallets, air-gapped signing, etc. Finally, in order to provide an easy method for selecting a particular concrete implementation of a WalletController interface, the concept of registering “WalletDriver”s has been introduced. A wallet driver is essentially the encapsulation of a factory function capable of create a new instance of a Wallet Controller.