Add support for skin-toned emojis

[andrrms]

This plugin MUST support skin-toned emojis (👍👍🏻👍🏼👍🏽👍🏾👍🏿) since they're a fundamental part of Unicode emojis.

Quick thoughts:

• Maybe it can use neutral-toned emojis (👍) + Unicode general skin tone codes (🏻🏼🏽🏾🏿) // Is this possible?
• It can be accessed like this:

ctx.emoji`${"like:medium-dark"}` // 👍🏾
ctx.emoji`${"punch:light"}` // 👊🏻
ctx.emoji`${"raised_hands"}` // 🙌

[andrrms]

With further investigation, I discovered that it is possible to have emoji modifiers to change it's skin tones. Tone modifier goes from range U+1F3FB to U+1F3FF. The next step now is to split emojis list into two lists, emojis.json and skin-emojis.json. That way, it is possible to apply modifiers in a simple way.