Check/Clean problematic emulators

[LizardWiz]

atari800 (lame hack for .multidisk/.data directories, these directories are not validated so some of it is brute force)
snesmsu1 (parse extra directories from .sh file)
scummvm (get extra directories from scummvm.ini)

[mrludo001]

Fixed a bug in the code for snesmsu1 (#190 )