Auto Generate unicode-emoji.json

[Steve0Greatness]

I've created a script that(partially) automates the process of generating assets/unicode-emoji.json. It can be found at Steve0Greatness/forumoji-auto-gen-emoji-list. I've tested it locally on my system, and it should generate a nearly identical JSON as assets/unicode-emoji.json(except for formatting, I don't believe that way of formatting it is possible to automate)(the comments are also different).