- locking exercise now keeps the owner

- owner can always lock exercise even if he has no group permission
- we now send back the owner for the exercises (overview)
- some auto formatting

src/ClientServer/Config/Constants.cs

@@ -13,7 +13,7 @@ namespace ClientServer.Helpers
     /// </summary>
     public static class Constants
     {
-        public static string VersionString = "2.2.9";
+        public static string VersionString = "2.2.10";
         
         /// <summary>
         /// the port to use

src/ClientServer/Controllers/Core/Exercises/ExerciseEditorController.cs

@@ -1328,6 +1328,8 @@ namespace ClientServer.Controllers.Core.Exercises
         {
             if (!await base.IsLoggedIn()) return;
 
+            int userId = GetUserId();
+            
             var exercise = await _context.Exercises
                 .FirstOrDefaultAsync(p => p.Id == exerciseId);
 
@@ -1351,20 +1353,22 @@ namespace ClientServer.Controllers.Core.Exercises
                 return;
             }
 
-            //moving an exercise is like changing...
-            if (
-                !base.HasGroupPermission(targetUserGroup.Id,
-                    permission => permission != null && permission.CanLockExercisesPermanently))
+            if (exercise.UserId != userId) //owner can always lock
             {
-                await
-                    Response.WriteAsync(
-                        Jc.Serialize(new BasicResponse(ResponseCode.NoPermission, "no permission")));
-                return;
+                //moving an exercise is like changing...
+                if (
+                    !base.HasGroupPermission(targetUserGroup.Id,
+                        permission => permission != null && permission.CanLockExercisesPermanently))
+                {
+                    await
+                        Response.WriteAsync(
+                            Jc.Serialize(new BasicResponse(ResponseCode.NoPermission, "no permission")));
+                    return;
+                }
             }
 
             exercise.IsPermanentlyLocked = true;
             exercise.IsOnlyVisibleToOwner = false;
-            exercise.UserId = null;
 
             try
             {

src/ClientServer/Models/Users/SystemRolePermission.cs

@@ -28,7 +28,7 @@ namespace ClientServer.Models.Users
         /// </summary>
         public bool CanCreateRoles { get; set; }
         /// <summary>
-        /// true: can change roles, false: not
+        /// true: can change roles (update role permissions), false: not
         /// TODO MAYBE system roles AND group roles currently
         /// </summary>
         public bool CanChangeRoles { get; set; }