Implement full operator support

[lukeeey]

Introduction

This pull request allows you to change your game mode, the world difficulty, default game mode and game rules from in-game. Additionally, coordinates will now be hidden if the reducedDebugInfo game rule (which only exists in java edition) is enabled.

Due to an issue with MCProtocolLib, difficulty changing is currently disabled.

I have shoved a few things in WorldManager so i can override it if Geyser is run as a bukkit plugin which probably wasnt the best way to go about it, but im making this PR now for feedback.

[lukeeey]

I’ll make an issue at MCProtocolLib if I remember about the ClientSetDifficultyPacket, I’m out now though so can’t really

[lukeeey]

This can be further improved when plugin messaging support is added for Floodgate, as then we dont need to use the hacky method of sending the /gamemode or /defaultgamemode or /gamerule command in chat

[mtsr]

I'd be interested in (helping) fixing the showCoordinates. What's holding up this PR besides a good rebase? Is there any significant rework needed? Want me to pick it up and finish it?

[lukeeey]

It’s not fully done and I’m too busy to work on it

[Heath123]

It’s not fully done and I’m too busy to work on it

They're asking what they need to finish to get it ready to be merged, not why it isn't ready I think

[mtsr]

Exactly. I just want to know if and what I can do to help. I'll find my way around the code, mostly need some help with the conceptual side and architecture/design of geyser.

• Is this PR still in line with the design for Geyser or does it need conceptual changes? In particular is the WorldManager approach OK, or can we come up with a different approach?
• Does it need any implementation changes or does it just need finishing?
• Is there other functionality that needs to be added, i.e. more operator functionality?
• Are you OK with me picking up some of the work?

[Redned235]

Superseded by #1035.