Due to copyright issues with potentially displaying Apple emojisets on
non-apple devices, as well as iamcal dropping support for the emojione
emojiset (see https://github.com/iamcal/emoji-data/pull/142), we are
dropping (perhaps temporarily) support for allowing users to switch
emojisets in Zulip.
This commit just hides the feature from the user but leaves most of
the infrastructure in place so that in the future if we decide to
re-enable the support we will not need to redo the infrastructure work
(some JS-side code is deleted, mostly because we'll want to re-add the
feature using the do_settings_change infrastructure anyway).
The most likely emoji set to add is the legacy "blobs" Google emoji
set, since it seems popular with some users.
Tweaked by tabbott to remove some additional JS code and update the
changelog.
Harshit Bansal