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/BaseGuildGump.cs

@@ -120,7 +120,7 @@ namespace Server.Guilds
 
             for (var i = 0; i < disallowed.Length; i++)
             {
-                if (s.IndexOf(disallowed[i], StringComparison.Ordinal) != -1)
+                if (s.IndexOfOrdinal(disallowed[i]) != -1)
                 {
                     return false;
                 }

Projects/UOContent/Gumps/Guilds/New Guild System/DiplomacyGump.cs

@@ -26,7 +26,7 @@ namespace Server.Guilds
                 "",
                 0,
                 GuildDisplayType.All,
-                World.Guilds.Values.CastListCovariant<BaseGuild, Guild>(),
+                World.Guilds.Values.SafeConvertList<BaseGuild, Guild>(),
                 1063136 + (int)GuildDisplayType.All
             )
         {
@@ -44,7 +44,7 @@ namespace Server.Guilds
                 filter,
                 startNumber,
                 display,
-                World.Guilds.Values.CastListCovariant<BaseGuild, Guild>(),
+                World.Guilds.Values.SafeConvertList<BaseGuild, Guild>(),
                 1063136 + (int)display
             )
         {
@@ -224,7 +224,7 @@ namespace Server.Guilds
                     }
             }
 
-            return !(Insensitive.Contains(g.Name, filter) || Insensitive.Contains(g.Abbreviation, filter));
+            return !(g.Name.InsensitiveContains(filter) || g.Abbreviation.InsensitiveContains(filter));
         }
 
         public override Gump GetResentGump(
@@ -285,7 +285,7 @@ namespace Server.Guilds
                     return 1;
                 }
 
-                return Insensitive.Compare(x.Name, y.Name);
+                return x.Name.InsensitiveCompare(y.Name);
             }
         }
 
@@ -365,7 +365,7 @@ namespace Server.Guilds
                     return 1;
                 }
 
-                return Insensitive.Compare(x.Abbreviation, y.Abbreviation);
+                return x.Abbreviation.InsensitiveCompare(y.Abbreviation);
             }
         }
     }

Projects/UOContent/Gumps/Guilds/New Guild System/GuildMemberInfoGump.cs

@@ -277,7 +277,7 @@ namespace Server.Guilds
             }
             else
             {
-                if (Insensitive.Equals(title, "none"))
+                if (title.InsensitiveEquals("none"))
                 {
                     m_Member.GuildTitle = null;
                 }

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);
             }
         }