Add profile property to toggle alternate scrolling

Summary:
Konsole sends up/down key press events to programs running in the shell
if they indicate they are not interested in mouse events. This adds a
profile property to toggle this behaviour.

BUG: 170582
FIXED-IN: 18.08

Reviewers: #konsole, hindenburg

Reviewed By: #konsole, hindenburg

Subscribers: #konsole

Tags: #konsole

Differential Revision: https://phabricator.kde.org/D12139