This removes an argument that was false only for a single widget:
naviframe. Hopefully this logic is now simpler, even though it involves
a small hack within naviframe itself.
Ref T5363
Some names have not been changed, hopefully making a distinction
between legacy APIs and internal code (elm_layout_blah) and valid EO
usages.
This means many internal functions are still elm_layout_ as their
sole purpose is to support the legacy API.
Ref T5315
Jean-Philippe Andre