Summary:
Attributes to be used by the API export tool. For end users, no changes
in the public API (except for a new attribute in generated classes).
Also simplifies constructor forwarding by not needing to pass the type
of the first "generated" class to compare.
Currently only automatically generated items are tagged.
Depends: D9259
Reviewers: vitor.sousa, felipealmeida
Reviewed By: vitor.sousa
Subscribers: cedric, #reviewers, #committers
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D9270