* Convert `mem::zeroed()` / `0` to `MaybeUninit::uninit()`
As noted in #792 changes like this might help us more strictly identify
and validate that the argument in question is only relevant as an output
argument (i.e. structs with `sType` are read by the function call, even
if the caller strictly expects return values there, so that it can fill
in multiple structures in a `pNext` chain, and must hence be `Default`-
initialized).
* Use uninit `Vec`s with late `set_len()` call instead of zero-initialization
* Use `uninit()` instead of `-1` for file descriptors
* Introduce `set_vec_len_on_success()` helper for `Vec::with_capacity()`
[Dependabot complains] that:
the binary target name `examples` is forbidden, it conflicts with with cargo's build directory names
And fails to provide dependency upgrades for Rust code. Fix that by
renaming the folder and crate to `ash-examples`.
[Dependabot complains]: https://github.com/ash-rs/ash/network/updates/748770724
