til_settings: pivot settings path printing to til_str

This eliminates more open_memstream() usage in favor of the new
til_str stuff.

While here I've split up the path construction API exposing the
til_str oriented variants, rather than only providing a
FILE*-oriented API.  This way you just use the FILE* stuff when
convenient (like printing to stdout/stderr) and go til_str_t when
you're building up a buffer.

Such is life in a sans-open_memstream-world.

Also while here the FILE*-oriented settings path printers were
renamed s/print/fprint/g hence touching setup.c

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