remove emoticons option

[tenzap]

• 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

[tenzap]

@kingster, What about this one? Missed it?