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/Engines/ConPVP/DuelContext.cs

@@ -1396,7 +1396,7 @@ namespace Server.Engines.ConPVP
                 return;
             }
 
-            if (Insensitive.Contains(e.Speech, "i wish to duel"))
+            if (e.Speech.InsensitiveContains("i wish to duel"))
             {
                 if (!pm.CheckAlive())
                 {
@@ -1432,7 +1432,7 @@ namespace Server.Engines.ConPVP
                     e.Handled = true;
                 }
             }
-            else if (Insensitive.Equals(e.Speech, "change arena preferences"))
+            else if (e.Speech.InsensitiveEquals("change arena preferences"))
             {
                 if (!pm.CheckAlive())
                 {
@@ -1448,7 +1448,7 @@ namespace Server.Engines.ConPVP
                     }
                 }
             }
-            else if (Insensitive.Equals(e.Speech, "showladder"))
+            else if (e.Speech.InsensitiveEquals("showladder"))
             {
                 e.Blocked = true;
                 if (!pm.CheckAlive())
@@ -1487,7 +1487,7 @@ namespace Server.Engines.ConPVP
                     }
                 }
             }
-            else if (Insensitive.Equals(e.Speech, "viewladder"))
+            else if (e.Speech.InsensitiveEquals("viewladder"))
             {
                 e.Blocked = true;
 
@@ -1509,7 +1509,7 @@ namespace Server.Engines.ConPVP
                     }
                 }
             }
-            else if (Insensitive.Contains(e.Speech, "i yield"))
+            else if (e.Speech.InsensitiveContains("i yield"))
             {
                 if (!pm.CheckAlive())
                 {