Replace fixed-width integer types with `std::`-prefixed variants

The headers make use of a lot of e.g. `uint32_t`, which could be replaced by `std::uint32_t` .
The former is provided by `` (C), while `` (C++) provides both.
Notably, when using the std module, only `std::` variants are provided with `import std` and would eliminate the header entirely.

It would be a bit of work to get this done, so I wanted to make sure something like this was even desirable.

No specific files or tests are named. Start by locating the headers that use fixed-width types such as uint32_t and checking how they include or . Done means the applicable uses consistently use std::uint32_t-style names and the headers no longer depend on the C header where the issue permits.

Written by the indexing model from the issue text.