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/Multis/ContestHouses.cs

@@ -221,7 +221,8 @@ namespace Server.Multis
 
             if (Fixtures != null)
             {
-                writer.WriteItemList(Fixtures, true);
+                Fixtures.Tidy();
+                writer.Write(Fixtures);
             }
             else
             {
@@ -240,7 +241,7 @@ namespace Server.Multis
 
             for (var i = 0; i < count; i++)
             {
-                AddFixture(reader.ReadItem());
+                AddFixture(reader.ReadEntity<Item>());
             }
         }
     }