lnwallet: add a BtcWallet implementation of WalletController

This commit adds the first concrete implementation of the
WalletController interface: BtcWallet. This implementation is simply a
series of wrapper functions are the base btcwallet struct.

Additionally, for ease of use both the BlockChain IO and Signer
interface are also implemented by BtcWallet. Finally a new WalletDriver
implementation has been implemented, and will be register by the init()
method within this new package.

lnwallet/config.go

@@ -1,60 +1,15 @@
 package lnwallet
 
-import (
-	"path/filepath"
-
-	"github.com/roasbeef/btcd/chaincfg"
-	"github.com/roasbeef/btcutil"
-)
-
-var (
-	// TODO(roasbeef): lnwallet config file
-	lnwalletHomeDir = btcutil.AppDataDir("lnwallet", false)
-	defaultDataDir  = lnwalletHomeDir
-
-	defaultLogFilename = "lnwallet.log"
-	defaultLogDirname  = "logs"
-	defaultLogDir      = filepath.Join(lnwalletHomeDir, defaultLogDirname)
-
-	btcdHomeDir        = btcutil.AppDataDir("btcd", false)
-	btcdHomedirCAFile  = filepath.Join(btcdHomeDir, "rpc.cert")
-	defaultRPCKeyFile  = filepath.Join(lnwalletHomeDir, "rpc.key")
-	defaultRPCCertFile = filepath.Join(lnwalletHomeDir, "rpc.cert")
-
-	// defaultPubPassphrase is the default public wallet passphrase which is
-	// used when the user indicates they do not want additional protection
-	// provided by having all public data in the wallet encrypted by a
-	// passphrase only known to them.
-	defaultPubPassphrase = []byte("public")
-
-	walletDbName = "lnwallet.db"
-)
-
-// Config...
+// Config..
 type Config struct {
-	DataDir string
-	LogDir  string
-
-	DebugLevel string
-
-	RpcHost  string // localhost:18334
-	RpcUser  string
-	RpcPass  string
-	RpcNoTLS bool
-
-	RPCCert string
-	RPCKey  string
-
-	CACert []byte
-
-	PrivatePass []byte
-	PublicPass  []byte
-	HdSeed      []byte
-
-	// Which bitcoin network are we using?
-	NetParams *chaincfg.Params
-}
-
-// setDefaults...
-func setDefaults(confg *Config) {
+	// default csv time
+	// default cltv time
+	// default wait for funding time
+	// default wait for closure time
+	// min amount to accept channel
+	// min fee imformation
+	//  * or possibly interface to predict fees
+	// max htlcs in flight?
+	// possible secret derivation functions
+	//
 }