Allow Volumes Spanning Across Multiple Devices

[a-raccoon]

The idea is simple, and hopefully just as easy to implement.

Volumes that can span across multiple devices, or even files, to create a single large volume from multiple sources.

For example: Purchase four 14 TB hard drives and create a single 50.9 TiB volume from it.

Miscellaneous: Work out if it's feasible to still mount a spanned volume when one of the devices are missing, and simply throw "read errors" when attempting to access files from those "bad sectors." Until those missing devices come online again.