Image Emojis: Emojis in chat

Changelog:

• Added the BOTH suggestion mode that combines ACTUAL and TEMPLATES modes
• The output emojis.zip/assets/minecraft/font/default.json file will be merged with the server resource pack's JSON file (if it contains one) in case the mergeWithServerResourcePack is set to true.
  In other words, the server resource pack's custom symbols won't be overwritten by emojis in the default.json file (instead, they will be merged together).
• When an HTTP server starts, the resource pack is now available only a URL with a generated hash which makes it harder for someone to download the resource pack directly
• An HTTP server won't start if the enforcementPolicy is set to NONE as it doesn't make sense