Detect devices

[Eneris]

Live device local media switch

Device strategy

• New device is set as active and old is backuped
• When device is removed, old settings is recovered or default is set

[Eneris]

This PR should be considered after first one (contains commits from previous one)

[ibc]

It looks ok, but I see an empty line in the device selectors. It's not another option with empty value (in fact, it's a <span> rather than a <div> as real device lines):

Other than that, it looks nice :)

[Eneris]

Thanks - it was "empty" options for default value but i see that's not needed with that form module

[ibc]

Sorry for the delay, we are very busy with other stuff. Let's check next week and merge it. Thanks!