Setup and control loop devices.
Provides rust interface with similar functionalty to the linux utility losetup
.
```rust use loopdev::LoopControl; let lc = LoopControl::open().unwrap(); let ld = lc.next_free().unwrap();
println!("{}", ld.path().unwrap().display());
ld.attach_file("test.img").unwrap(); // ... ld.detach().unwrap(); ```