Cleanup Commands

[JustAHuman-xD]

Description

This PR is made to cleanup all of the command classes & make them more readable, after this PR a PR could be opened to abstract a lot of these checks to further improve the state of the command classes, I am leaving that separate to avoid going out of scope and make it more manageable. Blame Jeff for the opening of this PR 👍

Proposed changes

Change almost all Command classes to use more guard statements, add missing annotations, and just general cleanup. This PR does go against the code style guidelines, discuss in developers chat

Related Issues (if applicable)

N/A

Checklist

• I have fully tested the proposed changes and promise that they will not break everything into chaos.
• I have also tested the proposed changes in combination with various popular addons and can confirm my changes do not break them.
• I have made sure that the proposed changes do not break compatibility across the supported Minecraft versions (1.16.* - 1.20.*).
• I followed the existing code standards and didn't mess up the formatting.
• I did my best to add documentation to any public classes or methods I added.
• I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values
• I added sufficient Unit Tests to cover my code.

[github-actions]

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[github-actions]

Slimefun preview build

A Slimefun preview build is available for testing!
Commit: 0c9c8d8b

https://preview-builds.walshy.dev/download/Slimefun/3935/0c9c8d8b

Note: This is not a supported build and is only here for the purposes of testing.
Do not run this on a live server and do not report bugs anywhere but this PR!

[iTwins]

Saw you missed these. Also SlimefunTabCompleter.java had some annotations that I couldn't comment on.
I think this looks a lot cleaner than it did before.

[JustAHuman-xD]

I completely forgot about this whoops, I'll actually work on this today

[JustAHuman-xD]

(Could I get some reviews and testing on this)

[WalshyDev]

Needs rebase

https://pastebin.com/S1mUPrhp

[J3fftw1]

I tested this on a version that doesnt break heads.
Since we need a rebase for that see walshys comment.
This is good to go
Tested all commands.

[J3fftw1]

Can we get a rebase here?