Refactor out protocol and luhn (protocol dependency) packages

internal/config/config.go

@@ -28,8 +28,8 @@ import (
 	"strconv"
 
 	"github.com/calmh/logger"
+	"github.com/syncthing/protocol"
 	"github.com/syncthing/syncthing/internal/osutil"
-	"github.com/syncthing/syncthing/internal/protocol"
 	"golang.org/x/crypto/bcrypt"
 )
 

internal/config/config_test.go

@@ -21,7 +21,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/syncthing/syncthing/internal/protocol"
+	"github.com/syncthing/protocol"
 )
 
 var device1, device2, device3, device4 protocol.DeviceID

internal/config/wrapper.go

@@ -21,9 +21,9 @@ import (
 	"path/filepath"
 	"sync"
 
+	"github.com/syncthing/protocol"
 	"github.com/syncthing/syncthing/internal/events"
 	"github.com/syncthing/syncthing/internal/osutil"
-	"github.com/syncthing/syncthing/internal/protocol"
 )
 
 // An interface to handle configuration changes, and a wrapper type á la