loop+cmd: extract types into swap module

interface.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/btcsuite/btcutil"
 	"github.com/lightninglabs/loop/loopdb"
+	"github.com/lightninglabs/loop/swap"
 	"github.com/lightningnetwork/lnd/lntypes"
 )
 
@@ -235,28 +236,6 @@ type SwapInfoKit struct {
 	LastUpdateTime time.Time
 }
 
-// Type indicates the type of swap.
-type Type uint8
-
-const (
-	// TypeIn is a loop in swap.
-	TypeIn Type = iota
-
-	// TypeOut is a loop out swap.
-	TypeOut
-)
-
-func (t Type) String() string {
-	switch t {
-	case TypeIn:
-		return "In"
-	case TypeOut:
-		return "Out"
-	default:
-		return "Unknown"
-	}
-}
-
 // SwapInfo exposes common info fields for loop in and loop out swaps.
 type SwapInfo struct {
 	loopdb.SwapStateData
@@ -265,7 +244,7 @@ type SwapInfo struct {
 
 	SwapHash lntypes.Hash
 
-	SwapType Type
+	SwapType swap.Type
 
 	loopdb.SwapContract