Modernize zlib

[seionmoya]

Background

.NET has it's own implementation of ZlibStream, but it's only available since .NET 6. It uses P/Invoke-ed Intels variant of zlib. Since this won't be usable within EFT, there are a variety of C# managed zlib libraries out there that we could. Here is a quick overview of the situation:

• All of github libraries originate from ComponentAce.Compression.Libs.zlib
• Elskom/zlib.managed:1.1.4.0 contains fixes to the above and is the most up to date.
• Elskom/zlib.managed:main is the most modernized, throws and exception when deflating (System.InvalidOperationException in Deflate.Compress Elskom/zlib.managed#182)
• bsg.componentace.compression.libs.zlib uses ArrayPool and Microsoft.Extensions.ObjectPool
• SixLabors/ZlibStream:main refactored the codebase but is WIP
• Every other library is an outdated fork of ComponentAce.Compressions.Libs.zlib

Currently we are using Elskom/zlib.managed:1.1.4.0, but there is plenty of room to improve the codebase. Due to compatability constraints of EFT's implementation of zlib, I believe the best option here is to modernize our implementation of zlib.

Goals

• Port the functional parts from Elskom/zlib.managed:main
• Improve code readability using SixLabors/ZlibStream:main as inspiration
• Implement stream pools for zlibstream where applicable
• If possible, make it a drop-in replacement of bsg.componentace.compression.libs.zlib to improve EFT's performance

Changes

• Using Span<T>, ReadOnlySpan<T>
• Added SimpleZlib (a wrapper around MemoryZlib)
• Moved ZOutputStream from ComponentAce.Compression.Libs.Zlib to Elskom.Generic.Libs
• Changed Fuyu.Common.Compression.Zlib to MemoryZlib, moved to Zlib.Managed
• Changed Fuyu.Common.Compression.ZlibCompression to CompressionLevel, moved to Zlib.Managed
• Changed Deflate.ConfigTable to Dictionary<CompressionLevel, Config>
• Changed some constants to enums
• Removed elskom code signing (EFT doesn't use it)
• Removed unused classes from Elskom.Generic.Libs (not used internally)