C# 9 Cleanup (#325)

- [X] Removes EventArgs - not needed
- [X] Merges sequential checks
- [X] Removes redundant type declarations

Projects/UOContent/Engines/MLQuests/QuesterNameAttribute.cs

@@ -7,7 +7,7 @@ namespace Server.Engines.MLQuests
     public class QuesterNameAttribute : Attribute
     {
         private static readonly Type m_Type = typeof(QuesterNameAttribute);
-        private static readonly Dictionary<Type, string> m_Cache = new Dictionary<Type, string>();
+        private static readonly Dictionary<Type, string> m_Cache = new();
 
         public QuesterNameAttribute(string questerName) => QuesterName = questerName;