[Feature Request] Dynamic player menu

[RedSparr0w]

Would it be easy enough to add a dynamic menu for showing all/online/offline players.
Could maybe also implement it for the guis that require a target if a target hasn't been specified manually?

Possible menu options could include:
menu_type: online_players, offline_players, all_players
layout: left, right, top, bottom, centered_x, centered_y, centered

[DaniFoldi]

I've been thinking a lot about this, and while online_players may be feasible, in order to support the latter two, the plugin would have to keep track of all players that have joined - which I consider a bit out of scope.
If you have any suggestions on how online_players could be specified in the config (remember, currently item slots are the "key"), please let me know.