Detect a known data file with a programmatically chosen version number
Some IWADs (e.g, Freedoom) are updated quite frequently so recognizing only specific versions of them will necessitate constantly adding new detection rules to
databundles.dei manually. Instead, Doomsday should be able to detect the IWAD based on file name, etc. and choose a version number based on associated metadata (e.g, file modification time).