* Add craft-raster-codecs: DDS, DICOM, FITS, IFF/ILBM, PCX, PNM and XPM from PhotoCraft
One module per format, moved from photocraft-codecs at 63b641b5 with its tests.
Decoders return one flat Image and take Limits; encoders take an image already in a
layout the format stores. Layout planning, colour and the document mapping stay in the app.
* craft-raster-codecs: PCX reads four 8-bit planes as RGBA and version 4 headers; pcx::dimensions
Four 8-bit planes are red, green, blue and alpha: they decode to RGBA instead of being
refused. Version 4 (PC Paintbrush for Windows) headers are accepted. pcx::dimensions gives the
pixel size from the header without decoding.
Ported from the PCX reader of storytold/designcraft#2011.
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Co-authored-by: subha-2025 <218455239+subha-2025@users.noreply.github.com>
