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/Main.cs

@@ -61,9 +61,7 @@ namespace Server
         public static bool IsRunningFromXUnit =>
             m_IsRunningFromXUnit ??= AppDomain.CurrentDomain.GetAssemblies()
                 .Any(
-                    a => a.FullName?
-                        .ToUpperInvariant()
-                        .StartsWith("XUNIT", StringComparison.Ordinal) ?? false
+                    a => a.FullName.InsensitiveStartsWith("XUNIT")
                 );
 
         public static bool Profiling
@@ -346,7 +344,7 @@ namespace Server
 
             foreach (var a in args)
             {
-                if (Insensitive.Equals(a, "-profile"))
+                if (a.InsensitiveEquals("-profile"))
                 {
                     Profiling = true;
                 }