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/Gumps/Guilds/New Guild System/GuildRosterGump.cs

@@ -85,7 +85,7 @@ namespace Server.Guilds
                 return true;
             }
 
-            return !Insensitive.Contains(pm.Name, filter);
+            return !pm.Name.InsensitiveContains(filter);
         }
 
         public override Gump GetResentGump(
@@ -208,7 +208,7 @@ namespace Server.Guilds
                     return 1;
                 }
 
-                return Insensitive.Compare(x.Name, y.Name);
+                return x.Name.InsensitiveCompare(y.Name);
             }
         }
 
@@ -276,7 +276,7 @@ namespace Server.Guilds
                     return 1;
                 }
 
-                return Insensitive.Compare(x.GuildTitle, y.GuildTitle);
+                return x.GuildTitle.InsensitiveCompare(y.GuildTitle);
             }
         }