[Suggestion] Migrate to Kyori Adventure & MiniMessage

[Feniksovich]

Helpful enough to get rid with ugly codebase for sending title/action/boss bars and also representing consistent and neat approach to text formatting.

Adventure: https://docs.advntr.dev/index
MiniMessage Reference: https://docs.advntr.dev/minimessage/index.html

Paper supports Adventure natively since 1.16.5 build 473.