libdcp/src/profile.h, branch main

libdcp/src/profile.h, branch main DCP handling library https://git.carlh.net/cgit/libdcp/atom?h=main 2025-03-27T00:42:04Z Introduce and use dcp::Profile. 2025-03-27T00:42:04Z Carl Hetherington cth@carlh.net 2025-03-26T22:59:30Z urn:sha1:2ef30cbe66ca819588bf43d892223ed9864c0e9a This replaces the specific flags passed to DCP::write(), is a property of the CPL (where it seems to belong) and allows us to write what I hear is the correct metadata for this mythical Bv2.0 that somebody invented.