adding replaygain to DSF files

Hello,

I’ve just pushed a request on github to add replaygain on dsf files. I’ve made changes on MusicInfoTagLoaderFFmpeg.cpp to get replaygain info if the file is a dsf file, and on TagLoaderTagLib.cpp to call MusicInfoTagLoaderFFmpeg when reading a dsf file to get the replaygain info.

the push request: “Krypton: add replaygain to dsf files #12049”.