Contribution Clarification (xmp_set_row, xmp_add_channels, xmp_move_channels)

Hello. In the never-ending quest to make libxmp perfect, I thought the following functions would be useful (particularly for people writing trackers):

• xmp_set_row moves current playback position to a specified row; this pairs well with xmp_set_position
• xmp_add_channels modifies a MOD's number of channels; it is versatile, so as not to clog up libxmp's API
• xmp_move_channels offers versatility similar to xmp_add_channels

I have already made and tested the functions but have two questions:

• Are API additions like the above better suited for master or libxmp-devel?
• Please confirm the process of adding to libxmp's API. I see the following that need to be added: actual code, libxmp.h EXPORT declaration, libxmp.map declaration (under 4.4?), documentation in libxmp.rst, test module in test-dev directory. Did I miss anything?

Perhaps a CONTRIBUTING file could be added that addresses these questions (and any others that may arise in the future).

Thanks for everything and happy tracking!

Review the listed API touchpoints—libxmp.h, libxmp.map, libxmp.rst, and the test-dev directory—alongside the proposed CONTRIBUTING file. Determine which contribution questions and API-addition steps need documenting. Done means the process and required files are clearly explained for future contributors.