Move to Eo2 and adjust code accordingly

Move to Eo2 and adjust code accordingly

Eo2 is the new object system for the EFL, and the replacement for Eo. It
improves Eo1 in many ways that will be listed on the Wiki and discussed
on the ML before.

Another change this merge includes is using the slightly different API
eo2 offers in actual code.

For example:
eo_do(obj, elm_object_text_get(&text));
becomes:
eo_do(obj, text = elm_object_text_get());

@feature