* Adds `BeforeSerialized` for entities to handle cleanup.
* Adds `Created` and `LastSerialized` fields to all entities. While this is a big bloat, this will be necessary for identifying dangling references to other invalid entities.
* Changes formula for determining a valid reference to be _not null, not deleted, and reference's created date must be at or before the entities last serialized date_.
* Adds versioning to idx file and serializes `Created` and `LastSerialized`.
* Fixes Save Stats and also disables it by default.
- [X] Adds `AdhocPersistence` which replaces RunUO `Persistence`
- [X] Fixes a few minor bugs with EntityPersistence deserialization
- [X] Reverts/updates some serialization changes
- [X] Fixes an issue in BufferWriter where if SeekOrigin.End is used, it will yield the wrong index.
- [X] Changes BinaryFileWriter to dispose pattern
- [X] Removes World.SaveBuffers. They were dangerous and should be done in-line while the world is loading, even if it is slower
- [X] Fixes BufferReader Seek too
- [X] Changes BufferWriter to use uninitialized arrays to speed up resizing
- [X] Changes World loading so it doesn't buffer the whole file, even if it makes things slower. It lowers allocations/fragmentation over all which is good.
- [X] Changes World Loading to use uninitialized arrays and directly saves them to the SaveBuffer which eliminates having to open/load the files _again_ which is dangerous. Also looping through items while the world is running is dangerous since async references can and will cause exceptions.
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- [X] Fixes several bugs
- [X] Updates more ordinal issues
- [X] Cleans up the code a bit
- [X] Turns classes static that should have been
- [X] Changes TcpServer.Instances to a HashSet
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- [X] Fixes bugs in the buffer writer
- [X] Removes background save commands
- [X] Avoids calling Serialize() on deserialization
- In a future optimization I will copy the entire object to a buffer, deserialize using a SpanReader, then use that buffer for the SaveBuffer
- [X] Fixes issue with decay queue.
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- [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
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