Chunkloading fixes

[Alvsch]

Description

• Fixes multiplication overflow with 16+ view distance
• Fixes Increasing (in game) render distance (4 -> 12) breaks chunk generation #253

Testing

Checklist

Things need to be done before this Pull Request can be merged.

• Code is well-formatted and adheres to project style guidelines: cargo fmt
• Code does not produce any clippy warnings: cargo clippy
• All unit tests pass: cargo test
• I added new unit tests, so other people don't accidentally break my code by changing other parts of the codebase. How?

[Alvsch]

Ill rather have this pr be merged before fixing the last issue.

[DataM0del]

This fixes #253,
please add "Fixes #253" to the PR body, when the PR is merged, issue #253 will be closed automatically.

[Snowiiii]

For some reason i still get error messages, When increasing my render distance from 4 to 12 like in #253 Marking a chunk as not watched, but was vacant! (Vector2 { x: 13, z: -2 })

[Alvsch]

For some reason i still get error messages, When increasing my render distance from 4 to 12 like in #253 Marking a chunk as not watched, but was vacant! (Vector2 { x: 13, z: -2 })

I'm not able to replicate it, but it shouldn't cause any weird behaviours.