C# 9 Cleanup (#325)

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

Projects/UOContent/Items/Misc/EffectItem.cs

@@ -5,7 +5,7 @@ namespace Server.Items
 {
     public class EffectItem : Item
     {
-        private static readonly List<EffectItem> m_Free = new List<EffectItem>(); // List of available EffectItems
+        private static readonly List<EffectItem> m_Free = new(); // List of available EffectItems
 
         public static readonly TimeSpan DefaultDuration = TimeSpan.FromSeconds(5.0);