Added an invokeMethod hook to CommandsManager, that wraps method invocation and can be overridden

src/main/java/com/sk89q/minecraft/util/commands/CommandsManager.java

@@ -398,6 +398,11 @@ public abstract class CommandsManager<T> {
 
             Object instance = instances.get(method);
             
+            invokeMethod(parent, args, player, method, instance, methodArgs, argsCount);
+        }
+    }
+
+    public void invokeMethod(Method parent, String[] args, T player, Method method, Object instance, Object[] methodArgs, int level) throws CommandException {
         try {
             method.invoke(instance, methodArgs);
         } catch (IllegalArgumentException e) {
@@ -412,7 +417,6 @@ public abstract class CommandsManager<T> {
             throw new WrappedCommandException(e.getCause());
         }
     }
-    }
     
     /**
      * Returns whether a player has access to a command.