Summary:
Also removed uneeded methods.
Slice also may need some API love to be actually useful later.
ref T8292
Reviewers: segfaultxavi, felipealmeida, brunobelo, woohyun
Reviewed By: segfaultxavi
Subscribers: cedric, #reviewers, #committers
Tags: #efl
Maniphest Tasks: T8292
Differential Revision: https://phab.enlightenment.org/D10327