Add "Change ROMs file type for selected games" feature

Or implement the feature into “Change ROMs folder…”.

I imported extracted .cue files to LB because certain platform required extracted files to be able to run it. After some time i switched emulator that allows to run games in .zip. I don’t want to delete the whole set and import the whole set again from the start in .zip. Allow to direct the whole set from .cue to .zip or vise versa, and not only between .cue and .zip but for any file type.