D29534: Implement wheel/touchpad scrolling for SpinBox control

[Nathaniel Graham]

ngraham edited the test plan for this revision.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D29534

To: ngraham, #vdg, #plasma
Cc: cblack, kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns