unicode input kitten: Add an option :option:kitty +kitten unicode_input --emoji-variation to control the presentation variant of selected emojis

Fixes #2139

docs/changelog.rst

@@ -30,6 +30,10 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 
 - diff kitten: Allow diffing remote files easily via ssh (:iss:`727`)
 
+- unicode input kitten: Add an option :option:`kitty +kitten unicode_input
+  --emoji-variation` to control the presentation variant of selected emojis
+  (:iss:`2139`)
+
 - Add specialised rendering for a few more box powerline and unicode symbols
   (:pull:`2074` and :pull:`2021`)
 

docs/kittens/unicode-input.rst

@@ -22,3 +22,8 @@ In :guilabel:`Name` mode you instead type words from the character name and use
 keys/tab to select the character from the displayed matches. You can also type
 a leading period and the index for the match if you don't like to use arrow
 keys.
+
+Command Line Interface
+-------------------------
+
+.. include:: ../generated/cli-kitten-unicode_input.rst