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/Mobiles/Mobile.cs

@@ -7,6 +7,7 @@ using System.Runtime.CompilerServices;
 using System.Runtime.Serialization;
 using System.Text;
 using Server.Accounting;
+using Server.Buffers;
 using Server.ContextMenus;
 using Server.Guilds;
 using Server.Gumps;
@@ -5674,8 +5675,7 @@ namespace Server
                 return false;
             }
 
-            var sb = new StringBuilder(text.Length, text.Length);
-
+            using var sb = new ValueStringBuilder(stackalloc char[Math.Min(text.Length, 256)]);
             for (var i = 0; i < text.Length; ++i)
             {
                 sb.Append(text[i] != ' ' ? GhostChars.RandomElement() : ' ');