recovery

Currently, RecoverPy only works with Linux systems.
This is due to the different tools it uses under the hood but theoretically it could be adapted to work on macOS.

grep, dd and even progress are compatible with macOS, so no change needed here.
But lsblk is not so here is the first difference.

Additions needed I can think of right now are:

• Detect if OS is Linux or macOS (done).