Converts Item & Entity Packets (#326)

- [X] Converts World Item packets
- [X] Converter Remove Entity packets
- [X] Updates `LOSBlocker` and `Blocker`
- [X] Fixes a few bugs
- [X] Converts container packets

Bumps release version

Projects/Benchmarks/Packets/BenchmarkPacketBroadcast.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Buffers;
-using System.Runtime.InteropServices;
 using BenchmarkDotNet.Attributes;
 using BenchmarkDotNet.Jobs;
 using Server;
@@ -69,16 +68,14 @@ namespace Benchmarks
             return writer.Position;
         }
 
-        private Pipe<byte>[] _pipes = new Pipe<byte>[512];
-        private IntPtr[] _pointers = new IntPtr[512];
+        private Pipe<byte>[] _pipes = new Pipe<byte>[25000];
 
         [IterationSetup]
         public void SetUp()
         {
             for (var i = 0; i < _pipes.Length; i++)
             {
-                _pipes[i] = new Pipe<byte>(new byte[8192]);
-                _pointers[i] = Marshal.AllocHGlobal(8192);
+                _pipes[i] = new Pipe<byte>(new byte[4096]);
             }
         }
 
@@ -88,7 +85,6 @@ namespace Benchmarks
             for (var i = 0; i < _pipes.Length; i++)
             {
                 _pipes[i] = null;
-                Marshal.FreeHGlobal(_pointers[i]);
             }
         }
 
@@ -151,30 +147,28 @@ namespace Benchmarks
             return _pipes.Length;
         }
 
+        private static void SendUnicodeMessageWithSpan(Pipe<byte> pipe, string text)
+        {
+            Span<byte> buffer = stackalloc byte[OutgoingMessagePackets.GetMaxMessageLength(text)];
+            var length = CreateUnicodeMessage(
+                ref buffer,
+                Serial.MinusOne, -1, MessageType.Regular, 0x3B2, 3, "ENU", "System", text
+            );
+
+            buffer = buffer.Slice(0, length);
+            var result = pipe.Writer.TryGetMemory();
+            result.CopyFrom(buffer);
+            pipe.Writer.Advance((uint)buffer.Length);
+        }
+
         [Benchmark]
-        public int TestSpanWriterAllocH()
+        public int TestSpanWriterLooped()
         {
             var text = "This is some really long text that we want to handle. It should take a little bit to encode this.";
 
-            foreach (var pointer in _pointers)
+            foreach (var pipe in _pipes)
             {
-                Span<byte> buffer;
-                unsafe
-                {
-                    buffer = new Span<byte>(pointer.ToPointer(), 8192);
-                }
-
-                CreateUnicodeMessage(
-                    ref buffer,
-                    Serial.MinusOne,
-                    -1,
-                    MessageType.Regular,
-                    0x3B2,
-                    3,
-                    "ENU",
-                    "System",
-                    text
-                );
+                SendUnicodeMessageWithSpan(pipe, text);
             }
 
             return _pipes.Length;