efl: remove EFL_EO_API_SUPPORT macro

efl: remove EFL_EO_API_SUPPORT macro

Summary:
Since we're now going to be shipping some eo classes as stable,
there is no point in keeping the eo api behind a macro, and it
should be enabled by default. Another case is beta classes, but
those are behind the EFL_BETA_API_SUPPORT guard.

This also changes includes around the place where things are
clearly broken (such as an included header needing something
from another header but that other header being guarded, notably
efl_ui_widget.h needing focus manager but focus manager being
behind beta in Elementary.h)

Reviewers: zmike, cedric, bu5hm4n, stefan_schmidt, segfaultxavi

Reviewed By: cedric, segfaultxavi

Subscribers: segfaultxavi, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8322

Change-Id: I2161b4b1aa388f968641fa6b0d318597bd30d964