Replacing Networking (#271)

- [X] Removing Kestrel & Libuv
- [X] Cleaning up NetState
- [X] Removing System.IO.Pipelines
- [X] Cleaning up packet reading
- [X] Adds a maximum of 5000 sockets (configurable) to prevent OOM
- [X] Replaces the AsyncState with a thread-safe wrapped boolean called NetworkState
- [X] Removes Parallel.ForEach (no perf gain)
- [X] Removes custom houses compression on another thread
- [X] Test high load scenarios

Bumps release version

Projects/UOContent/Misc/HexStringConverter.cs

@@ -1,65 +0,0 @@
-using System;
-
-namespace Server.Misc
-{
-    public class HexStringConverter
-    {
-        public static readonly uint[] m_Lookup32Chars = CreateLookup32Chars();
-
-        private static uint[] CreateLookup32Chars()
-        {
-            var result = new uint[256];
-            for (var i = 0; i < 256; i++)
-            {
-                var s = i.ToString("X2");
-                if (BitConverter.IsLittleEndian)
-                {
-                    result[i] = s[0] + ((uint)s[1] << 16);
-                }
-                else
-                {
-                    result[i] = s[1] + ((uint)s[0] << 16);
-                }
-            }
-
-            return result;
-        }
-
-        public static unsafe string GetString(ReadOnlySpan<byte> bytes)
-        {
-            var result = new string((char)0, bytes.Length * 2);
-            fixed (char* resultP = result)
-            {
-                var resultP2 = (uint*)resultP;
-                for (var i = 0; i < bytes.Length; i++)
-                {
-                    resultP2[i] = m_Lookup32Chars[bytes[i]];
-                }
-            }
-
-            return result;
-        }
-
-        public static unsafe void GetBytes(string str, Span<byte> bytes)
-        {
-            fixed (char* strP = str)
-            {
-                var i = 0;
-                var j = 0;
-                while (i < str.Length)
-                {
-                    int chr1 = strP[i++];
-                    int chr2 = strP[i++];
-                    if (BitConverter.IsLittleEndian)
-                    {
-                        bytes[j++] = (byte)(((chr1 - (chr1 >= 65 ? 55 : 48)) << 4) | (chr2 - (chr2 >= 65 ? 55 : 48)));
-                    }
-                    else
-                    {
-                        bytes[j++] = (byte)((chr1 - (chr1 >= 65 ? 55 : 48)) | ((chr2 - (chr2 >= 65 ? 55 : 48)) << 4));
-                    }
-                }
-            }
-        }
-    }
-}