[access] enhance access features

[access] enhance access features

  1. add smart_activate(); to access object.
  2. add an API _elm_access_activate_callback_set();
    - this callback is called when user wants to activate access object
      which would represent widget item or edje part object.
  3. add owner referece to the Elm_Access_Info for access object.
  4. clock: use _elm_access_activate_callback_set();

SVN revision: 79199