Use `std::bitset` for shader bit-iterations

[Wunkolo]

Uses std::bitset for bool-uniforms and component-mask iteration: https://en.cppreference.com/w/cpp/utility/bitset

[wheremyfoodat]

I'm not sure I feel particularly great about using bitset for the boolean uniforms, especially when they are directly accessed in JIT code and the standard doesn't guarantee a specific size or layout, nor do I really think it reduces the mental overhead for the component mask stuff...