Add support for the standard MacOS emoji keyboard command.

[trueheart78]

MacOS utilizes the cmd+ctrl+space command to display the emoji keyboard. As a new user that has heavily adopted the usage of emoji in everyday life, I struggled to figure out how to display the emoji keyboard.

After a lot of due-diligence (which included searching the repository), I finally found the input_unicode_character command, which calls the unicode_input kitten. I was then able to add support to my configuration file, and now it works off from muscle memory.

map cmd+ctrl+space input_unicode_character

While the unicode_input kitten is not identical to the emoji keyboard provided by MacOS, it still is the primary way to access emoji, and I wanted to pay-it-forward so that future MacOS users can migrate even easier.

Knowing what I know now, and re-referencing the website, I was able to find mention of the unicode_input option. However, as someone that never references them as Unicode-based input, and instead calls them emoji, this was overlooked. It's not very evident as a new user doing a search about how to access them. Is there a way I could also assist in helping update the documentation to call out the emoji-based support?

[kovidgoyal]

Sure if you want to send a PR improving the docs feel free. I have
already added a commit setting that shortcut as a default shortcut on
macOS for unicode input.

[trueheart78]