[Help Wanted] Add Brigadier command suggestion filtration

[lokka30]

Help Wanted!

If you want to try have a stab at implementing this, please leave a comment below, and/or feel free to chat to me on the Discord in #other-lokka30-plugins.

What & Why

At the moment, any Vanilla or Brigadier-registered commands, e.g. /gamemode (vanilla registered, so it uses Brigadier) and /blackwidow (we use Brigadier) won't have their argument suggestions filtered.

For example, if you try to make a rule that blocks the suggestion of /gamemode creative, it is not possible. However, blocking its execution works as expected.

This is because PlayerCommandSendEvent only sends the base commands that the server wants to suggest the player. We are meant to use TabCompleteEvent to listen for arguments, however, this event does not fire for Brigadier (and thus also Vanilla)-registered commands (unless you are in console?????? which there, it works fine?).

---

Implementation Wanted

I'm unsure how to approach this at the moment, and will edit this with any updates. Regardless, I want BlackWidow to be able to block command argument suggestions for Brigadier commands. So, if someone wants to hide /gamemode creative from the suggestions list, or /bw version, they can do so.