Fix bad serials (#304)

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

Bumps release version
Updates documentation

Projects/UOContent.Tests/Misc/HexStringConverterTest.cs

@@ -1,19 +0,0 @@
-using System;
-using Xunit;
-
-namespace Server.Tests.Accounting
-{
-    public class HexStringConverterTest
-    {
-        [Theory]
-        [InlineData("ABCDEF1234", new byte[] { 0xAB, 0xCD, 0xEF, 0x12, 0x34 })]
-        public void ConvertsProperly(string input, byte[] bytes)
-        {
-            Span<byte> outputBytes = stackalloc byte[input.Length / 2];
-            HexStringConverter.GetBytes(input, outputBytes);
-
-            Assert.Equal(bytes, outputBytes.ToArray());
-            Assert.Equal(input, HexStringConverter.GetString(bytes));
-        }
-    }
-}