Updates Serialization (#292)

- [X] Removes all save strategies
- [X] Removes duplicate file writer that won't be used
- [X] Removes persistence (it will become a duplicate system)
- [X] Add a save position variable to skip serializing a clean item/mobile
- [X] Update Guilds/Accounts to be IEntity types
    - Because guilds are abstract, this may make serialization tricky.
- [X] Update the generalized IEntity writing
- [X] Update the load/save to write to buffers then to files in background


Bumps release version

Projects/UOContent/Gumps/Guilds/New Guild System/DiplomacyGump.cs

@@ -26,7 +26,7 @@ namespace Server.Guilds
                 "",
                 0,
                 GuildDisplayType.All,
-                Utility.CastListCovariant<BaseGuild, Guild>(new List<BaseGuild>(BaseGuild.List.Values)),
+                Utility.CastListCovariant<BaseGuild, Guild>(new List<BaseGuild>(World.Guilds.Values)),
                 1063136 + (int)GuildDisplayType.All
             )
         {
@@ -44,7 +44,7 @@ namespace Server.Guilds
                 filter,
                 startNumber,
                 display,
-                Utility.CastListCovariant<BaseGuild, Guild>(new List<BaseGuild>(BaseGuild.List.Values)),
+                Utility.CastListCovariant<BaseGuild, Guild>(new List<BaseGuild>(World.Guilds.Values)),
                 1063136 + (int)display
             )
         {