[FEATURE] [PLUGIN] - PAPI Placeholders

[lucian929]

I have checked...

• [x] ...if there are any similar features in other branches
• [x] ...if there are any similar issues
• [x] ...if such a feature is already planned

Complete description

%is_linked% - Boolean

%booster% - Boolean, returns true if the member is boosting the server.

%voice_channel% - String, returns the voice channel the member is currently in. Returns nothing if the player is not in a voice channel.

%user_name% - String, returns Discord username. Raindropz#0766 (ignores special characters & emojis in the user's name)

%user_id% - Returns user ID Reason for feature request n/a

[Skyslycer]

I would personally remove %voice_channel%, because it takes 2 requests, and all of them are synchronous.