C# 9 Cleanup (#325)

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

Projects/Server.Tests/Tests/Network/Packets/Utilities/PacketTestUtilities.cs

@@ -9,6 +9,6 @@ namespace Server.Tests.Network
             p.Compile(false, out var length).AsSpan(0, length);
 
         public static NetState CreateTestNetState() =>
-            new NetState(new MockSocket());
+            new(new MockSocket());
     }
 }