Update dependencies; refactor for nalgebra 0.29 support

[19h]

Hey,

this updates nalgebra (and all other dependencies) to the latest releases.

This required slight refactoring (i.e. *point.to_homogeneous().data is not a slice anymore but a container that exposes as_slice and as_mut_slice).

Additionally, since you last released pico-detect, many new suggestions have been added to clippy. This addresses most of the issues it raised.

Most importantly, this refactors the MaybeUninit calls to construct an array of MaybeUninit first before later overwriting the respective fields and finally transmuting the [MaybeUninit; ..] to [T; ..].

Thanks for this library!

[rostyq]

Wow! That's a lot of work. Thank you, too!