Change default setting to copy Unicode emoji

[rugk]

IMHO nowadays Unicode emojis as it are much more popular than : emojis (emoji shortcodes). The codes are only supported by a limited number of platforms, but the Unicode ones are supported by all.

[kazerniel]

It would also be nice to have the option to insert the unicode symbol to active input (like we can with the :name: format one).

[rugk]

Just FYI (shameless ad here), I've made a new emoji helper/add-on, because the development of this one here did not really go forward:
https://github.com/rugk/awesome-emoji-picker
#127