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/Mobiles/Mobile.cs

@@ -2567,20 +2567,13 @@ namespace Server
             AddNameProperties(list);
         }
 
-        public BufferWriter SaveBuffer { get; set; }
+        BufferWriter ISerializable.SaveBuffer { get; set; }
 
         [CommandProperty(AccessLevel.Counselor)]
         public Serial Serial { get; }
 
         public int TypeRef { get; }
 
-        public void Serialize()
-        {
-            SaveBuffer ??= new BufferWriter(true);
-            SaveBuffer.Reset();
-            Serialize(SaveBuffer);
-        }
-
         public virtual void Serialize(IGenericWriter writer)
         {
             // The item is clean, so let's skip
@@ -2628,7 +2621,8 @@ namespace Server
 
             writer.Write(CreationTime);
 
-            writer.Write(Stabled, true);
+            Stabled.Tidy();
+            writer.Write(Stabled);
 
             writer.Write(CantWalk);
 
@@ -6393,7 +6387,7 @@ namespace Server
                 case 25:
                 case 24:
                     {
-                        Corpse = reader.ReadItem() as Container;
+                        Corpse = reader.ReadEntity<Container>();
 
                         goto case 23;
                     }
@@ -6406,7 +6400,7 @@ namespace Server
                 case 22: // Just removed followers
                 case 21:
                     {
-                        Stabled = reader.ReadStrongMobileList();
+                        Stabled = reader.ReadEntityList<Mobile>();
 
                         goto case 20;
                     }
@@ -6461,13 +6455,13 @@ namespace Server
                     }
                 case 13:
                     {
-                        GuildFealty = reader.ReadMobile();
+                        GuildFealty = reader.ReadEntity<Mobile>();
 
                         goto case 12;
                     }
                 case 12:
                     {
-                        m_Guild = reader.ReadGuild();
+                        m_Guild = reader.ReadEntity<BaseGuild>();
 
                         goto case 11;
                     }
@@ -6491,7 +6485,7 @@ namespace Server
                     }
                 case 8:
                     {
-                        m_Holding = reader.ReadItem();
+                        m_Holding = reader.ReadEntity<Item>();
 
                         goto case 7;
                     }
@@ -6599,7 +6593,7 @@ namespace Server
 
                         Skills = new Skills(this, reader);
 
-                        Items = reader.ReadStrongItemList();
+                        Items = reader.ReadEntityList<Item>();
 
                         m_Player = reader.ReadBool();
                         m_Title = reader.ReadString();