fix(core): Optimizes strings / .NET 5 compatibility changes (#354)

- [X] Removes some string allocations (e.g. split)
- [X] Optimizes some collections
- [X] Converts insensitive to extension methods of built-ins.
- [X] Adds ordinal (case sensitive) string helpers
- [X] Fixes conditionals for in-game commands so they use Ordinal comparisons.
- [X] Replaces ToLower.Contains with InsensitiveContains
- [X] Adds ValueStringBuilder
- [X] Implements ValueStringBuilder in a few places where it makes sense
- [X] Removes the redundant Wrap function and replaces it with an optimized version
- [X] Fixes list conversions in Utility

Closes #351

Bumps release version

Projects/UOContent/Accounting/Security/SHA2PasswordProtection.cs

@@ -27,7 +27,7 @@ namespace Server.Accounting.Security
         public string EncryptPassword(string plainPassword)
         {
             var password = plainPassword.AsSpan(0, Math.Min(256, plainPassword.Length));
-            var bytes = new byte[Encoding.ASCII.GetByteCount(password)];
+            var bytes = GC.AllocateUninitializedArray<byte>(Encoding.ASCII.GetByteCount(password));
             Encoding.ASCII.GetBytes(password, bytes);
 
             return m_SHA2HashProvider.ComputeHash(bytes).ToHexString();