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/Mobiles/BaseCreature.cs

@@ -3775,12 +3775,12 @@ namespace Server.Mobiles
                 {
                     var word = wordsString[i];
 
-                    if (Insensitive.Equals(word, wordName))
+                    if (word.InsensitiveEquals(wordName))
                     {
                         bFound = true;
                     }
 
-                    if (bWithAll && Insensitive.Equals(word, "all"))
+                    if (bWithAll && word.InsensitiveEquals("all"))
                     {
                         return true;
                     }