Implement approx traits for direction types
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# Objective `approx` has traits like [`AbsDiffEq`](https://docs.rs/approx/latest/approx/trait.AbsDiffEq.html), [`RelativeEq`](https://docs.rs/approx/latest/approx/trait.RelativeEq.html), and [`UlpsEq`](https://docs.rs/approx/latest/approx/trait.UlpsEq.html). Glam implements them for its math types when the `approx` feature is enabled. Bevy's `Direction2d` and `Direction3d` should implement these too. ## Solution Implement the traits. See [how Glam implements them for its own math types](https://github.com/bitshifter/glam-rs/blob/main/src/features/impl_approx.rs). For the epsilon values, I use the same as `Vec2`/`Vec3` (just `f32::EPSILON`).
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Objective
approxhas traits likeAbsDiffEq,RelativeEq, andUlpsEq. Glam implements them for its math types when theapproxfeature is enabled. Bevy'sDirection2dandDirection3dshould implement these too.Solution
Implement the traits. See how Glam implements them for its own math types. For the epsilon values, I use the same as
Vec2/Vec3(justf32::EPSILON).