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/Server/IEntity.cs

@@ -45,8 +45,10 @@ namespace Server
             Deleted = false;
         }
 
-        public BufferWriter SaveBuffer { get; set; }
+        BufferWriter ISerializable.SaveBuffer { get; set; }
+
         public int TypeRef { get; } = -1;
+
         public Serial Serial { get; }
 
         public Point3D Location { get; private set; }
@@ -97,10 +99,6 @@ namespace Server
             && p.Y >= Location.m_Y - range
             && p.Y <= Location.m_Y + range;
 
-        public void Serialize()
-        {
-        }
-
         public void Deserialize(IGenericReader reader)
         {
             // Should not actually be saved