Summary:
This allows using the @beta tag in classes, like this:
class @beta Efl.Foo extends Efl.Bar { ... }
This will surround the class definition in the .eo.h file with an
EFL_BETA_API_SUPPORT #define, equivalent to tag every method and
event with @beta.
Test Plan: Nothing changes since no class uses this tag yet
Reviewers: q66, bu5hm4n, zmike
Reviewed By: q66
Subscribers: cedric, #reviewers, #committers
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D7933
19fcd6e60f