Add support for fetching UTXOs from a peer using the getutxo message.
WalletTemplate: rename Controller to MainController
WalletTemplate: Move sync progress to BitcoinUIModel.
Backport some more UI code from Lighthouse in preparation for a better sync progress bar.
WalletAppKit: configure Orchid/Tor to use the same directory as bitcoinj uses.
WalletTemplate: New sync UI using the notification bar system. Wire up Tor initialisation so startup is less boring to look at.