UdevQt: Don't use QVariant for property values + cleanup

Review Request #125963 - Created Nov. 5, 2015 and updated

Information
David Rosca
solid
master
Reviewers
solid

Don't use QVariant for property values because libudev only works with strings, so it makes no sense to convert it to QVariant.
Device::decodedDeviceProperty() was removed because it's not used anywhere. It was unescaping backslashes and converting hex->dec, but that should do the user of the library if necesary.

Also drop support for building with very old libudev versions.

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