Register touch screen edges in effects

Summary:
All effects which use a (pointer) screen edge now also support the touch
screen edges. These are:
 * Cube (cylinder, sphere)
 * DesktopGrid
 * PresentWindows (current, all, class)

Reviewers: #kwin, #plasma

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D5269