fix(core): Fixes several serialization issues (#355)

- [X] Fixes an issue where a buffer smaller than 8 bytes would not double with enough space in some cases.
- [X] Fixes an issue with dupe copying the savebuffer reference (ugh).
- [X] Streamlines the IGenericWriter API to use better generics.
- [X] Streamlines the IGenericReader API to use better generics.
- [X] Forces `tidying` of a List/HashSet to be done externally since Writers/Readers should not have side effects.
- [X] Fixes an issue where Tidying a list didn't TrimExcess, causing memory leaks.
- [X] Reverted the meaning of `World.Running` to specifically refer to any world state post world loading.
  - NOTE: Do not use this if you want to block on world saves. Instead use checks against `WorldState.Saving` states.
- [X] Fixes an issue with serializing negative DateTime deltas.
- [X] Fixes a potential issue with serializing non-UTC DateTime.

Bumps release version

Projects/UOContent/Items/Misc/KeyRing.cs

@@ -155,7 +155,7 @@ namespace Server.Items
 
             writer.WriteEncodedInt(0); // version
 
-            writer.WriteItemList(Keys);
+            writer.Write(Keys);
         }
 
         public override void Deserialize(IGenericReader reader)
@@ -164,7 +164,7 @@ namespace Server.Items
 
             var version = reader.ReadEncodedInt();
 
-            Keys = reader.ReadStrongItemList<Key>();
+            Keys = reader.ReadEntityList<Key>();
         }
 
         private class InternalTarget : Target