Support squashfs mounting

[whocares0101]

For example batocera can already do this and it also has an autorun.cmd to allow games to run automatically.
Squashfs mounting would be great and maybe adding support for batocera's autorun.cmd would be nice as well, it could be extended to allow setting all wine related configs the game needs so everything can be packaged into a single squashfs without any external files or config.

https://wiki.batocera.org/systems:windows