dcpomatic/src/lib/image_png.cc, branch fmt

dcpomatic/src/lib/image_png.cc, branch fmt DCP-o-matic DCP tools https://git.carlh.net/cgit/dcpomatic/atom?h=fmt 2024-12-25T23:27:08Z Replace String::compose with fmt::format(). 2024-12-25T23:27:08Z Carl Hetherington cth@carlh.net 2024-12-23T20:53:32Z urn:sha1:8caf013a9b8d709ed7c3d5e9febee0067e6fcf1f Move Image::as_png() out to image_as_png(). 2022-04-28T22:11:17Z Carl Hetherington cth@carlh.net 2021-12-18T20:26:05Z urn:sha1:7ec6c86c913fba820870565ee757fdf43ae47433