BlackBerry: Add 'Deploy Qt libraries' action to Device options page

This allows the user to deploy Qt libraries onto the device
to be used later instead of bundling the Qt libraries with the
bar package.

Change-Id: I95f4b47c3fed8109ffc5ba4ea90f884177cdeab4
Reviewed-by: Mehdi Fekari <mfekari@blackberry.com>
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>
BlackBerry: Ignore current directory when deploying Qt libraries to device

Make sure to handle the case where the string returned from BaseQtVersion::versionInfo()
is empty, as that would lead to the current folder being included in the files
to deploy to the device.

Change-Id: Ic715fe078bbadf3edbaefc68aeca5eea06af8417
Reviewed-by: Mehdi Fekari <mfekari@blackberry.com>
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>