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/Server/Commands.cs

@@ -188,7 +188,7 @@ namespace Server
 
         public static bool Handle(Mobile from, string text, MessageType type = MessageType.Regular)
         {
-            if (!text.StartsWith(Prefix, StringComparison.Ordinal) && type != MessageType.Command)
+            if (!text.StartsWithOrdinal(Prefix) && type != MessageType.Command)
             {
                 return false;
             }
@@ -198,7 +198,7 @@ namespace Server
                 text = text.Substring(Prefix.Length);
             }
 
-            var indexOf = text.IndexOf(' ', StringComparison.Ordinal);
+            var indexOf = text.IndexOfOrdinal(' ');
 
             string command;
             string[] args;