Clear worlds and player cache when logical server stops

[KevinDaGame]

What type of PR is this? (check all applicable)

• Feature
• Refactor
• Bug Fix
• Optimization
• Documentation Update

Description

The cache was not cleared, meaning that if you rejoined a world, the mod would still take from the cache, and crash the logical server because it's invalid.

Also implemented the unload world listener to prevent memory leak

QA Instructions, Screenshots, Recordings

1. load a singleplayer world
2. do snipe actions
3. leave and load again
4. do snipe actions
5. see that it works

Added/updated tests?

• Yes
• No, and this is why: please replace this line with details on why tests
  have not been included
• I need help with writing tests
• Not needed

[optional] What gif best describes this PR or how it makes you feel?

[Lennart99]

LGTM, but just a thought, shouldn't we also remove Players when they leave? Doesn't look like we are doing that on Forge (although it does any matter for servers)

[KevinDaGame]

LGTM, but just a thought, shouldn't we also remove Players when they leave? Doesn't look like we are doing that on Forge (although it does any matter for servers)

Good point. I have implemented it