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Nowadays, messages can contain both unicode emoji and text smileys.
This extension/options doesn't bring a real added value IMO. Moreover it had to be enabled by the user to be effective
the emoticons js scripts contained pictures licensed under CC-BY-SA-2.5 which is not DFSG compatible. See:
https://wiki.debian.org/DFSGLicenses#Creative_Commons_Attribution-ShareAlike_3.0_Unported_.28CC_BY-SA_3.0.29
CI3 has a Smiley plugin which does an equivalent job and is marked as deprecated https://codeigniter.com/userguide3/helpers/smiley_helper.html