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/Account.cs

@@ -775,7 +775,7 @@ namespace Server.Accounting
             }
 
             m_PasswordAlgorithm = algorithm;
-            Password = password.Replace("-", string.Empty, StringComparison.Ordinal);
+            Password = password.ReplaceOrdinal("-", string.Empty);
             return true;
         }