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/Misc/RenameRequests.cs

@@ -25,7 +25,7 @@ namespace Server.Misc
                     0,
                     NameVerification.Empty,
                     NameVerification.StartDisallowed,
-                    Core.ML ? NameVerification.Disallowed : new string[] { }
+                    Core.ML ? NameVerification.Disallowed : Array.Empty<string>()
                 ))
                 {
                     if (Core.ML)