• ASB + CONTROLLER: Add withdraw-btc and refresh-bitcoin-wallet JSON-RPC commands. withdraw-btc allows withdrawing BTC from the internal Bitcoin wallet to a specified address. The amount parameter on the wire protocol is in satoshis (Option<u64>, null to sweep the entire balance). The asb-controller accepts human-friendly amounts (e.g. 0.1 BTC, 10000 sat). refresh-bitcoin-wallet syncs the internal Bitcoin wallet with the blockchain.