Removing warnings in elm_tests.

Removing warnings in elm_tests.

Most of the errors referred to the cast from int to void* in x86_64.
This need conversion to long, as intermediate.

Some calls to elm_widget not exposed API were changed to their similar
at elm_object API.

Elm_Photo never call "drop" smart callback, but i leave the callback
in tests.

And others API methods are included in Elementary.h

Now elementary build with -Wall -Werror in x86_64.

SVN revision: 52691