Speed up client cam using Set

[Nul-led]

Title says it all.

Confirm the following:

• [x] I have tested these changes (by compiling, running, and playing) and have seen no unintended differences in gameplay

[Nul-led]

err i thought about closing this tbh. Benchmarks dont really seem that useful. Sometimes its way faster sometimes not, depends on factors i dont know which is why i didnt merge it yet. If u feel like testing this more throughly feel free :)

[Excigma]

I feel like whatever is better for readability and maintainability should be prioritized

[Nul-led]

I suppose using Sets is a good idea then 🤔 but its my code so ig im biased lmao