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/Map.cs

@@ -397,7 +397,7 @@ namespace Server
                 return null;
             }
 
-            if (Insensitive.Equals(value, "Internal"))
+            if (value.InsensitiveEquals("Internal"))
             {
                 return Internal;
             }
@@ -419,7 +419,7 @@ namespace Server
                     continue;
                 }
 
-                if (index >= 0 && map.MapIndex == index || Insensitive.Equals(map.Name, value))
+                if (index >= 0 && map.MapIndex == index || map.Name.InsensitiveEquals(value))
                 {
                     return map;
                 }