[Enhancement] Toggle formatting of unicode emoji

[cheri-song]

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Description

Currently, MCDiscordChat formats emoji markdown (such as 😄) in a yellow color. Unlike the other formatting options, this is not configurable or able to be turned off.

This creates an incompatbility with mods like AOF Emotes which detect and replace emoji markdown with the image of the emoji.

Additionally, it would be a nice QoL feature to be able to change the color of the formatting or disable it.

Suggestion

Add a separate config option for emoji formatting, allowing players to change the color or disable formatting completely.

[Xujiayao]

Superseded by issue #226