EternalCore

GH-1258 Fix Quit/Death message performance by building Notice asynchronous. (#1258)

• Optimize join(first join)/quit message broadcasts to prevent main thread blocking by useless creating ton's of Notices

• Refactor imports and formatting in BukkitViewerProvider and PlayerQuitMessageController for consistent code style.

• Refactor PlayerJoinMessageController for cleaner conditional handling in join message logic.

• Compile death message async.

• Fix formatting.