PS2 images support

[xakep666]

@turbosagat reports

For PS2, games can still not be mounted, even with the workaround i described above.
As you know, they are not streamed directly from ps3netsrv but instead copied in full to the console, then run locally.
The copy process halts very early with an error.

PS2 copy failures are for both chd and iso, and iso fails on the master branch too so its worth marking this project doesn't support PS2 for now until you want to work on it.

This is strange issue needed to be addressed and debugged. Note that PS2 images on PS3 without CFW require some preparations for launch: https://github.com/aldostools/webMAN-MOD/wiki/Game-Paths-&-Covers/685847cd0b7a82909e0c0b2de12f7761403ea5e5

[xakep666]

Here is a description how does ps2 classic images encryption work: https://www.psx-place.com/threads/old-repost-ps2-classics-algorithm-published-by-flatz.37344/

Implementation: https://github.com/sdkmap/PS2Classics

Investigate if it's possible to add on-the-fly images generation. Does it make sense at all?