Apply 1:1 conversions from std -> no_std

[mooman219]

Initial work for #88.

Apply equivalent 1 to 1 conversions. Dependencies alloc and hashbrown are added. These are also dependencies in std. This doesn't make any API or logic changes, just a dependency cleanup.

There is not default format config, rustfmt.toml on this project. Is that intentional? I'd be happy to re-format if you push some config you like.

[pdeljanov]

Hi @mooman219,

Thanks for taking on this task. I'm sure there will be many people who appreciate this work!

Is there a way to do this conversion without having to invoke rustfmt?

The reason why there is no config is because I generally just don't want anyone to run rustfmt until I settle on a proper configuration. However, there are some challenges. First, many of the configuration options I'd like to use are nightly only (e.g., control_brace_style). Second, last time I checked there wasn't a very good way to vertically align things. Third, I need to go through the code and insert #[rustfmt::skip] where it belongs (such as on some big tables) which is a time consuming process.

Aside from that, having formatting changes in this PR also makes it difficult for me to review what has actually meaningfully changed.

Thanks!

[mooman219]

Hey @pdeljanov,

That's reasonable, here is it without formatting.

---

For fixed indentation I usually just format the code to force a desired wrapping:

pub const IDENTITY_MATRIX: Matrix4<f32> = Matrix4::new(
    1.0, 0.0, 0.0, 0.0, //
    0.0, 1.0, 0.0, 0.0, //
    0.0, 0.0, 1.0, 0.0, //
    0.0, 0.0, 0.0, 1.0, //
);

[pdeljanov]

Hey @mooman219,

Thanks! This looks a fairly straightforward and clear change. Thanks for that tip as well, very clever!

I missed your last reply to the issue you raised for this. I've left a reply now. For now I'll leave this PR open until we decide on the best way forward. :)