Find a way to fast-organize games in folders

[pascl]

With a lot of games, and a lot of folders, not so easy to quickly organize everything with the folder manager.

[pascl]

The core used in launch.sh is detected. An auto button was added which creates a folder by core.
If you use the same core for more than one system (for example, mgba for gb/gbc/gba), all will be mixed in a same folder.