WIP - Refactored config handling + Added /sf reload

[TheBusyBiscuit]

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Description

This pull requests moves the config-related stuff from SlimefunRegistry to a dedicated Config Manager. It also allows some basic reload functionality,, accessible via /sf reload (Many people requested this for a long time). Note that this is not fully finished though, so not all changes are supported and a lot will still require a restart.

Changes

• Added /sf reload
• Added Config Manager to handle our configs
• All relevant config files have been moved to this Config Manager class
• All relevant cached data was moved to the Config Manager too

Checklist

• [x] I have fully tested the proposed changes and promise that they will not break everything into chaos.
• [x] I have also tested the proposed changes in combination with various popular addons and can confirm my changes do not break them.
• [x] I followed the existing code standards and didn't mess up the formatting.
• [x] I did my best to add documentation to any public classes or methods I added.
• [x] 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.

[TheBusyBot]

Your Pull Request was automatically labelled as: "🧹 Chores" Thank you for contributing to this project! ❤️

[WalshyDev]

PR looks good aside from the comment I still have open.

[J3fftw1]

Closing this Superceding with an up to date branch #3908