s/files: add add_file_data for future code deduplication
s/files: add add_file_data for future code deduplication

Signed-off-by: Florian Pritz <753f544d2d01592750fb4bd29251b78abcfc8ecd@xinu.at>

jreinert/filebin,Bluewind/filebin,Bluewind/filebin,Bluewind/filebin,jreinert/filebin,jreinert/filebin,jreinert/filebin,Bluewind/filebin,Bluewind/filebin,jreinert/filebin,jreinert/filebin