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Also...
... bump min KF version to 5.80 (implies min Qt 5.14), needed for
    target-argument variant of ecm_qt_declare_logging_category()
    as well as min CMake version to 3.11, needed for add_library()
    without sources
... set TRANSLATION_DOMAIN also for ksanetwain

This reverts commit 0da9ba71.

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This decouples KSaneOption from KSaneOptionWidget so that it is possible to use the options directly in the future e.g. with an options model exposed to QML, and to split the widgets-based interface from the logic. The KSaneOption API is not meant to be final for this MR, but will be updated again later. As this MR is already quite large, I decided to stop here.

It basically removes the creation of the KSaneOptionWidget from the KSaneOption and all its widget members. Instead, KSaneOptionWidget is able to take a KSaneOption during construction.

As the widgets and the logic were heavily entangled before this MR, I could not really find a way to better split this up for the review so that it makes sense. There probably are some renames and added enums I could try to split out of this MR if that is preferred. The individual commits can all be compiled, but API changes in between and bugs are fixed later on, so I would like to squash them before merging.

Also add/move license files as required by REUSE specification

- do not block until sane backend has queried the info, but emit a signal once it is updated
- deprecate make() as it is the same vendor()
- add function the retrieve the internal device name of the currently opened device

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Fixup for da9de115

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