Support for WBMP & OTB formats

[reshane]

Hello,
I recently published a crate for encoding and decoding wbmp images here because it was supported by image magick but I couldn't find rust only support for the format. Given the PCX encoder/decoder implementation I thought the wbmp format could fit in well here.
Additionally, image magick also has support for otb images (over/on the air bitmaps, old nokia format).
Could I work on a PR to add support for the wbmp and otb formats to this library?

[fintelia]

The design of this crate is still a bit in flux based on the discussion in image-rs/image#2372 and me needing to write up guidelines on format eligibility. But those two formats seem like they'd be in scope, so with the understanding that things aren't decided yet, please do feel free to make a PR. If you have any feedback on the API as you're doing so, that would also be valuable to share!

[reshane]

Opened PR #2 to add the encoders / decoders for the two formats

As far as the API goes, if possible I think it might be nice to have some macros for registering Decoders, rather than

hooks::register_decoding_hook(ImageFormat::Pcx, Box::new(|r| Ok(Box::new(pcx::PCXDecoder(r)?))));

something like

hooks::register_decoder!(ImageFormat::Pcx, pcx::PCXDecoder);