Fix problem where rtepack types were not parsable (nor probably binary compatible)

[riclarsson]

No description provided.

[Copilot]

Pull request overview

This PR aims to make rtepack wrapper types (e.g., stokvec, specmat, propmat, muelmat) correctly parseable/streamable via the XML IO system by fixing binary IO directionality and adding a span-adapter for types that inherit from existing XML-IO-enabled base types.

Changes:

• Corrects the xml_io_stream binary streaming API to use get(span<T>, bifstream*) for reads and put(span<const T>, bofstream*) for writes.
• Introduces xml_io_stream_inherit<T, U> to adapt std::span<T> to std::span<U> for binary/text streaming methods.
• Switches rtepack XML IO specializations to use xml_io_stream_inherit instead of inheriting xml_io_stream<U> directly.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/core/xml/xml_io_stream.h	Fixes binary IO method signatures and adds xml_io_stream_inherit to bridge span-based IO between derived/base types.
src/core/rtepack/rtepack_stokes_vector.h	Updates xml_io_stream<rtepack::stokvec> to use the new inheritance/span adapter.
src/core/rtepack/rtepack_spectral_matrix.h	Updates xml_io_stream<rtepack::specmat> to use the new inheritance/span adapter.
src/core/rtepack/rtepack_propagation_matrix.h	Updates xml_io_stream<rtepack::propmat> to use the new inheritance/span adapter.
src/core/rtepack/rtepack_mueller_matrix.h	Updates xml_io_stream<rtepack::muelmat> to use the new inheritance/span adapter.

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