Better format and static type Gravity Zones

[mubinulhaque]

In accordance with style guide given here:

• Add doc comments to variables and functions where possible
• Replace exclamation marks with not keyword
• Format multiline statements for more readability
• Specify return type of function physics_pre_movement()
• Add spaces before and after operations and equals signs
• Rephrase and add comments for better clarity
• Remove spaces between colons and variable names
• Specify types of variables for clarity

Disclaimer

No generative AI was used to enhance or create the code given here.

[BastiaanOlij]

LGTM