Fix all of the nullable issues

MistoxServer/mPacket/NetworkPacketDictionary.cs

@@ -27,7 +27,7 @@ namespace Mistox.Attributes {
             foreach (Assembly assembly in assemblies) {
                 Type[] allClasses = assembly.GetTypes();
                 foreach( Type cur in allClasses) {
-                    mPacket attribute = cur.GetCustomAttribute<mPacket>(false);
+                    mPacket? attribute = cur.GetCustomAttribute<mPacket>(false);
                     if (attribute != null) {
 
                         // Generate a deterministic 16-bit ID based on the Type's FullName