Disable scanners that are connected while scan in progress

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Scanners are enabled by default when added to the ScannerDevices collections. This opt-out behaviour is usually beneficial as it is unlikely that there will be connected scanners that will not be used. However, devices that are connected after a scan timer has already been started were not 'approved' by the user to be part of the scanning operation.

• Scanners should be enabled by default when connected

  • If implemented, scanners should be enabled according to the user's settings (see Add settings panel and store user configuration settings #5)

• Scanners that are already part of the collection should use the existing enabled/disabled state for that scanner when connected

• Scanners that are connected during scanning should be disabled by default

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Implemented in #14