*im_livechat,rating.
Emojis are now encoded in unicode characters in messages. This
allows to copy/paste messages including emojis, ensures that
emojis are properly displayed in mail interfaces (at least those
that support unicode, e.g. GMAIL, counter-example: outlook), and
allows the user to directly use emojis of its smartphone in mobile.
This commit also adds several new emojis.
PR #11095