#142 Enhance IMGMOUNT to be able to optinally mount dirs on cues like mount

[i30817]

This would make it possible to both change 'cds' as dirs and attach audio tracks/files.

Which would make it possible to share files with engine replacements without duplicating the bytes if the original game doesn't have a no-cd or the engine replacement doesn't like it, like in scummvm or openlara etc.