Fix bad serials (#304)

- [X] Fixes bad serial calculations
- [X] Tightens HexStrings

Bumps release version
Updates documentation

Projects/Server.Tests/Network/Packets/Utilities/PacketTestUtilities.cs

@@ -1,14 +0,0 @@
-using System;
-using Server.Network;
-
-namespace Server.Tests.Network
-{
-    public static class PacketTestUtilities
-    {
-        public static Span<byte> Compile(this Packet p) =>
-            p.Compile(false, out var length).AsSpan(0, length);
-
-        public static NetState CreateTestNetState() =>
-            new NetState(new MockSocket());
-    }
-}