fix: Updates serialization to use v2.0 (#998)

- [X] Deletes serialization annotations
- [X] Updates to ModernUO.Serialization.Annotations nuget
- [X] Updates serializer to v2.0
- [X] Changes all `Serializable()` to `SerializationGenerator()`
- [X] Updates to schema generator v2.0

Projects/UOContent/Items/Addons/BaseAddon.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using ModernUO.Serialization;
 using Server.Multis;
 
 namespace Server.Items
@@ -20,7 +21,7 @@ namespace Server.Items
         bool CouldFit(IPoint3D p, Map map);
     }
 
-    [Serializable(3, false)]
+    [SerializationGenerator(3, false)]
     public abstract partial class BaseAddon : Item, IChoppable, IAddon
     {
         [SerializableField(1, "private", "private")]