Changing some strcts to classes

Author: Suiram1701

WebUntisAPI.Client/Models/Class.cs

@@ -17,7 +17,7 @@ namespace WebUntisAPI.Client.Models
     /// </summary>
     [DebuggerDisplay("Name = {LongName}")]
     [JsonConverter(typeof(ClassJsonConverter))]
-    public struct Class
+    public class Class
     {
         /// <summary>
         /// Id of the class

WebUntisAPI.Client/Models/Room.cs

@@ -12,7 +12,7 @@ namespace WebUntisAPI.Client.Models
     /// A Room
     /// </summary>
     [DebuggerDisplay("Name = {LongName}")]
-    public struct Room
+    public class Room
     {
         /// <summary>
         /// Id of the room

WebUntisAPI.Client/Models/School.cs

@@ -13,7 +13,7 @@ namespace WebUntisAPI.Client.Models
     /// Represent a Untis school
     /// </summary>
     [DebuggerDisplay("Name = {DisplayName}, Id = {SchoolId}")]
-    public struct School
+    public class School
     {
         /// <summary>
         /// Real name of the school

WebUntisAPI.Client/Models/Subject.cs

@@ -14,7 +14,7 @@ namespace WebUntisAPI.Client.Models
     /// A subject
     /// </summary>
     [DebuggerDisplay("Name = {LongName}")]
-    public struct Subject
+    public class Subject
     {
         /// <summary>
         /// Id of the subject