Remove unnecessary alloc

[w-utter]

Hello!

This should make things a bit quicker by removing all allocation from the hot loop, as well as acquiring the stdout lock on initalization.

stdout can still be a bit jumpy sometimes, that might be an issue with the shader idk 🤷

[chomosuke]

Thank you for that, will merge if you would seperate shader.rs into frame.rs and pixel.rs and also resolve the conflict :>

[w-utter]

Sounds good, If it's going to be this big of a change from the original pr I think that the api might as well be changed a bit as well, with Frame having a write_to(&self, &mut impl std::io::Write) -> std::io::Result<usize> in its impl instead of having it be handled in the main.rs (mostly writing this for myself when I get the chance to update it)