[Enhancement] Adds support for converting chd files to iso!

[INDRAPhilip]

I think the chd file and everything it brings is amazing, but sometimes we like to make changes to the original files like changing a game texture or files in the game code and in chd it's not as practical as in iso so I'd love a way to convert chd to iso!

[umageddon]

Chdman dosent support converting images to ISO. This tool is merely a front-end for CHDMAN.
Maybe sometime in the future I could think of adding additional features, but for now its going to stay just a front-end.