Add support for QTextBlockFormat::marker
This patch enables use of QTextBlockFormat::marker introduced in Qt 5.14. Using it, any list element can be marked with interactive checkbox. It adds a `KToggleAction` with which user can toggle this checkbox. Brief explanation of the logic: - If the cursor is already on a list, we just toggle the marker - If the cursor is not on a list, we have to add a list first (having a marker without a list just does nothing) - If the cursor was on the single-element list, and we have disabled the marker, disable the list too.
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