On to Menu class

I decided to begin the work on the Menu class. After going over the code I considered it not to be as hard as I thought to be.

I created the MENUITEM and OWNERITEM classes and added the constants needed by the API. Next I will go into the C code to add the stuctures for the new classes and then I'll prepare a testcase. Finally I'll begin the work on the class, method by method, like always.

After the menu class,,, I don't know, maybe someone will join me.. it feels pretty lonely here.