[Port] Makes gravity event based, QOL additions as well as bugfixes regarding gravity

[XeonMations]

About The Pull Request

Ports:

• [x] https://github.com/tgstation/tgstation/pull/61054
• [x] https://github.com/tgstation/tgstation/pull/74084
• [x] https://github.com/tgstation/tgstation/pull/79785
• [x] https://github.com/tgstation/tgstation/pull/76824
• [x] https://github.com/tgstation/tgstation/pull/74671
• [x] https://github.com/tgstation/tgstation/pull/38043 (I found parts of the code from this PR already in, and some parts missing for some reason)
• [x] https://github.com/tgstation/tgstation/pull/66037 (Gravity related code in living.dm)
• [x] https://github.com/tgstation/tgstation/pull/63791 (Gravity changes)
• [x] https://github.com/tgstation/tgstation/issues/66657 (Even more gravity changes)
• [x] https://github.com/tgstation/tgstation/pull/75333/
• [x] https://github.com/tgstation/tgstation/pull/76764/
• [x] https://github.com/tgstation/tgstation/pull/71664
• [x] https://github.com/tgstation/tgstation/pull/74285 (Partially)

Why It's Good For The Game

Bugfixes are good, as well as fixing there being constant checks for people's gravity.

Testing Photographs and Procedure

Screenshots&Videos

https://github.com/user-attachments/assets/de864f1a-1ce6-4b87-8c15-3329e4350468

https://github.com/user-attachments/assets/ccb17cd0-8c85-480e-8139-c0c074b4c475

https://github.com/user-attachments/assets/2e88f2ed-a51e-463b-b07e-588f5e7e0088

Changelog

:cl: Ghommie, LemonInTheDark, Kylerace, vinylspiders, MrMelbert, Fikou, AnturK, ShizCalev, OrionTheFox, XeonMations fix: Gravity generator now shows repair instructions on examine add: Proper functionality for upside down gravity, and high gravity situations refactor: Gravity is now event based, meaning you should have less downtime from moving into a weightless area and your gravity status changing. /:cl: