Added:
- AMScanThumbnailView::doubleClickDelay_ ~ How close together (ms) clicks have to be to consider them double-clicks
- AMScanThumbnailView::doubleClickTimer_ ~ QTimer used to measure how close clicks are together

Altered:
- AMScanThumbnailView::mouseReleaseEvent() ~ Now checks if this click was the second of a double-click, emits doubleClicked if was
- AMScanThumbnailView & AMScanDataView ~ Added a bunch of debugs, will be removed when Issue complete