We have two elementary test suite, what is more obvious than just adding
a third one! This testsuite aims for establishing a standard behaviour
for the interfaces we have added in efl now. This first part here brings
a few testcases for Efl.Pack which are currently only passing for
Efl.Ui.Box. More widgets will be added afterwards.
The testcases themself are not defined after what worked or did not
work, but rather what made sence (in my opinion ^_^).
ref T7767
Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Differential Revision: https://phab.enlightenment.org/D8518
