fix(core): Fixes various issues with codegen (#646)

- [X] Fixes bad `ReadEnum` by size
- [X] Fixes array, list, and set not handling null values properly.
  - It will be up to the user (for now) to null out empty lists using `[AfterDeserialization]`. Convenience may be added later.
- [X] Fixes errors with `dotnet clean` and non-empty generation folder
- [X] Fixes bad field indexes on `Account.cs` causing `tags` to not be serialized/deserialized.
  - This was caused by a duplicate entry. Don't have protection against this _yet_.

Projects/Server/Serialization/IGenericReader.cs

@@ -82,12 +82,12 @@ namespace Server
                         var num = ReadShort();
                         return *(T*)#
                     }
-                case 3:
+                case 4:
                     {
                         var num = ReadEncodedInt();
                         return *(T*)#
                     }
-                case 4:
+                case 8:
                     {
                         var num = ReadLong();
                         return *(T*)#