build-config.js

LDEV-4428 Add emojione and autoembed plugins
Both plugins were added as integrated plugins (so no need to specify
them as extraPlugins). At the same time Emojione button replaced Smiley
one.

As a side note, when adding Emojione plugin as integrated one, its icon
gets incorporated into icons.png incorrectly (the size of the icon is
much bigger than 16 px) that's why it doesn't get displayed at all. So
we need to tweak editor.css and replace CSS rule for
.cke_button__emojione_icon with the following:
.cke_button__emojione_icon {background:
url(../../plugins/emojione/icons/emojione.png?t=dee79e2) no-repeat 0 0
!important; background-size: 100% !important;}