KCharSelect: add categories dockfeat/kcharselect/category-dock

The category dock provides an easier way to navigate the Unicode tables compared to entering the table number
or manually scrolling until the desired table. The category names are officially defined by the Unicode standard
and are part of many character pickers nowadays.

The proposed dock provides a sortable and searchable hierarchy of categories and subcategories, can be moved, resized
or hidden and the settings are preserved at the next start.

The Unicode data is dynamically fetched at build time from the official Unicode website.

Signed-off-by: Philippe Mavridis <philippe.mavridis@yandex.com>

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