Fix bad serials (#304)

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

Bumps release version
Updates documentation

Projects/Server.Tests/Utility/EncodingHelpers.cs

@@ -1,16 +0,0 @@
-using System.Text;
-
-namespace Server.Tests
-{
-    public static class EncodingHelpers
-    {
-        public static Encoding GetEncoding(string bodyname) =>
-            bodyname switch
-            {
-                "utf-8"    => Utility.UTF8,
-                "utf-16"   => Utility.UnicodeLE,
-                "utf-16BE" => Utility.Unicode,
-                _          => Encoding.ASCII
-            };
-    }
-}