Couple of things for Smart Objects

Couple of things for Smart Objects

 * Subclass macro now gets a different function to retrieve the parent class,
   which should return a pointer to a fully set up class, instead of filling
   up one passed to it.
 * Add this functions and use them in SmartClippedObject and Box
 * New function to check the type of a Smart object all over its hierarchy tree

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/evas@47379 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33