Do not limit the swallowed objects to icon. This had to be done before
elm 1.0 and now it's time to break. This will break all applications
which are using gengrid/genlist. Please fix it icon_get -> content_get.
TODO
1. fix theme as well.
2. fix documents.
SVN revision: 64344
from here, it should be trivial to continually move more and more code into elm_gen.c and reduce duplication.
ideally we should be aiming for an elm_gen_* api where you differentiate between list/grid with style or something since the apis are almost identical
SVN revision: 64245