C# 9 Cleanup (#325)

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

Projects/UOContent/Engines/Factions/Mobiles/Guards/BaseFactionGuard.cs

@@ -188,7 +188,7 @@ namespace Server.Factions
                     _                   => faction.Definition.GuardAttack // ReactionType.Attack
                 };
 
-                if (def != null && def.Number > 0)
+                if (def?.Number > 0)
                 {
                     Say(def.Number);
                 }