multi: move Input interface and related code

This commit is a step to split the lnwallet package. It puts the Input
interface and implementations in a separate package along with all their
dependencies from lnwallet.

chainregistry.go

@@ -25,6 +25,7 @@ import (
 	"github.com/lightningnetwork/lnd/chainntnfs/neutrinonotify"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/htlcswitch"
+	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwallet/btcwallet"
@@ -63,14 +64,14 @@ const (
 // TODO(halseth): make configurable at startup?
 var defaultBtcChannelConstraints = channeldb.ChannelConstraints{
 	DustLimit:        lnwallet.DefaultDustLimit(),
-	MaxAcceptedHtlcs: lnwallet.MaxHTLCNumber / 2,
+	MaxAcceptedHtlcs: input.MaxHTLCNumber / 2,
 }
 
 // defaultLtcChannelConstraints is the default set of channel constraints that are
 // meant to be used when initially funding a Litecoin channel.
 var defaultLtcChannelConstraints = channeldb.ChannelConstraints{
 	DustLimit:        defaultLitecoinDustLimit,
-	MaxAcceptedHtlcs: lnwallet.MaxHTLCNumber / 2,
+	MaxAcceptedHtlcs: input.MaxHTLCNumber / 2,
 }
 
 // chainCode is an enum-like structure for keeping track of the chains
@@ -105,7 +106,7 @@ type chainControl struct {
 
 	feeEstimator lnwallet.FeeEstimator
 
-	signer lnwallet.Signer
+	signer input.Signer
 
 	keyRing keychain.KeyRing