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/GuildDeclareWarPrompt.cs

@@ -1,3 +1,4 @@
+using System.Linq;
 using Server.Guilds;
 using Server.Prompts;
 
@@ -36,7 +37,7 @@ namespace Server.Gumps
 
             if (text.Length >= 3)
             {
-                var guilds = BaseGuild.Search(text).CastListCovariant<BaseGuild, Guild>();
+                var guilds = BaseGuild.Search(text).SafeConvertList<BaseGuild, Guild>();
 
                 GuildGump.EnsureClosed(m_Mobile);