Update PCSX2 to support additional file types

[Jason Carr]

For completeness sake, I'd like to remark that currently PCSX2 besides iso, mdf, nrg, bin also supports img, dump, gz, cso. (gz with the highest compression by the way). ePSXe supports bin, iso, img, cue, ccd, mds, pbp and ecm.

[ALI ESSA]

What's this? LB already can import CSO, GZ