Eliminate some premature division #2

[sparr]

Summary

None

Purpose of change

Various places in the codebase divide integers before multiplying them, resulting in premature/unnecessary/extra truncation

Describe the solution

Rearranged code to put multiplications before divisions, or converted ints to floats sooner or at all in some calculations.

Describe alternatives you've considered

Testing

Ran test suite. Playing the game with this currently. I have not managed to reproduce most of the necessary scenarios yet, though.

Additional context

This is a sequel to #64808. I am open to suggestions to do more casts to float or double sooner, rather than just rearranging integer operations, especially where the result ends up in a float or double anyway.

[CLIDragon]

Would it be possible to write a clang-tidy lint for this?

[sparr]

I think a pretty simple lint check could catch at least half of these. I haven't had much luck figuring out how to write those yet, but this might inspire me to try harder.