Feature support emoji icons

[Lissy93]

Category: Feature

Overview
Adds support for using emojis as item icons. Some users do not like loading font-awesome, and since emojis are supported natively by most browsers, it seemed like something I should implement. Of course, font-awesome, favicon, generative, and direct-url item icon formats are all still supported.

Emojis can either be specified directly, or using shortcode, or using Unicode. E.g:

items:
  - title: Emoji
    icon: 🚀
  - title: Shortcode
    icon: ':rocket:'
  - title: Unicode
    icon: 'U+1F680'

Issue Number N/A

New Vars N/A

Screenshot (if applicable)

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance

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