Altered:
- AMScanThumbnailView ~ Altered paint logic to use standard palette
colours where possible.
Altered:
- AMScanTreeView ~ Changed selection mode in constructor from multi, to
extended. Now behaves like the other views
- AMScanThumbnailView::mouseMoveEvent() and mouseReleaseEvent() so that
the selection command they pass is changed to toggleCurrent if the user
is holding down the control key.