Cleanup & Fixes for .NET 5 (#309)

- [X] Fixes several bugs
- [X] Updates more ordinal issues
- [X] Cleans up the code a bit
- [X] Turns classes static that should have been
- [X] Changes TcpServer.Instances to a HashSet

Bumps release version

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

@@ -26,7 +26,7 @@ namespace Server.Guilds
                 "",
                 0,
                 GuildDisplayType.All,
-                Utility.CastListCovariant<BaseGuild, Guild>(new List<BaseGuild>(World.Guilds.Values)),
+                World.Guilds.Values.CastListCovariant<BaseGuild, Guild>(),
                 1063136 + (int)GuildDisplayType.All
             )
         {
@@ -44,7 +44,7 @@ namespace Server.Guilds
                 filter,
                 startNumber,
                 display,
-                Utility.CastListCovariant<BaseGuild, Guild>(new List<BaseGuild>(World.Guilds.Values)),
+                World.Guilds.Values.CastListCovariant<BaseGuild, Guild>(),
                 1063136 + (int)display
             )
         {

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

@@ -28,7 +28,7 @@ namespace Server.Guilds
             : base(
                 pm,
                 g,
-                Utility.SafeConvertList<Mobile, PlayerMobile>(g.Members),
+                g.Members.SafeConvertList<Mobile, PlayerMobile>(),
                 currentComparer,
                 ascending,
                 filter,