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Implement modules support (#15)

This implementation is based on bemanproject/exemplar#380

There are some key differences, however:

    I had to include library feature-test macros into global module fragment because import std; resulted in compilation errors when I tried gcc 16 and clang 21.

The cmake --build build step takes longer when configured with -DBEMAN_SCAN_VIEW_USE_MODULES=On - here is what Jason Merrill from Red Hat replied about slowdown in gcc 16.1:
I imagine it takes longer because it has to build module std, which includes the whole standard library, before building anything else. I don't know if there's a simple way to teach cmake to share std.gcm between projects/builds.

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