todo KDE 5 note

in KDE5, maybe add
- void MoivingRange::setBlockMode(bool enableBlockMode);
- bool MoivingRange::blockMode() const;
This way, arbitrary highlighting would work for colums as well. In fact, if implemented
correctly in the Kate Renderer, drawing block selection mode could use this, too.
The vi in put mode yank highlighting could use it, too: https://bugs.kde.org/show_bug.cgi?id=324695

A correct implementation needs to take care of MovingRangeFeedback, especially
of mouseEnteredRange(), mouseExitedRange(), caretEnteredRange() and caretEnteredRange()

CCBUG: 324695