fix(core): Fixes accounts and moves it to codegen (#644)

- [X] Fixes TimeSpan not working with codegen
- [X] Fixes bad check for generic classes with a serialize method and deserialize ctor
- [X] Moves Accounts to codegen so it is versioned
- [X] Fixes deserialization of old Accounts with no version variable.
- [X] Fixes deserialize seek not doing anything. 🙈 
- [X] Adds Email to serialization

Projects/SerializationGenerator/SerializableEntityGeneration/SerializableEntityGeneration.SerializeMethod.cs

@@ -44,12 +44,11 @@ namespace SerializationGenerator
 
             if (isOverride)
             {
-                source.AppendLine();
                 source.AppendLine($"{indent}base.Serialize(writer);");
+                source.AppendLine();
             }
 
             // Version
-            source.AppendLine();
             source.AppendLine($"{indent}writer.{(encodedVersion ? "WriteEncodedInt" : "Write")}(_version);");
 
             foreach (var property in properties)