Undeprecate the CS-Core stuff for now

[Seggan]

Description

Undepreated the old stuff in me.mrCookieSlime. This was done because we have no replacement yet, and the IDE warnings are getting annoying in addons. Deprecate these after having a replacement.

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 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: 5c1e617

https://preview-builds.walshy.dev/download/Slimefun/4187/5c1e617f

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!

[J3fftw1]

LGTM, i wanted this for a while now as well

[JustAHuman-xD]

Same here

[Sefiraat]

I’ve not had a chance to actually review the code changes (which I’m sure are sound) but I am all-for this change. 100% support this ha!