elm: Add an Edje layout for elm_win

elm: Add an Edje layout for elm_win

The layout has two parts, one for placing a menu bar on the window and
the other for placing the actual window contents. The content part is
an Evas box with a custom layout that mimics the standard widget
placement rules inside the window (adapted from resize_objects_eval
and resize_job)

Note: a custom layout was written here, because it's not possible to
use a common stacking layout, since applications do not follow the
stacking rules (they don't use EVAS_HINT_FILL and
evas_object_size_hint_align_set). Maybe, with time, applications
could be changed to use them, so the custom layout may be removed.

Patch by: Henrique Dante de Almeida <hdante@profusion.mobi>

SVN revision: 82957