New Features Released: Multi-select and Copy/Paste

There is a new Selection section in the Tools Panel with four buttons:

Select vertices - trigger click to select more than one vertex (and their faces). Grab to move/rotate the selection.
Copy - copies the current selection to the buffer
Paste - pastes the buffer and auto selects it. Grab to move/rotate the selection.
Delete selected - quickly delete vertices already selected. Useful for paste mistakes.

Also, a few notable bug fixes:

Scaling the parent object would make any subsequent movements of the reference images produce unexpected behavior.
A fix regarding scaling and bounding boxes.
Face selection is now easier to see.

Special thanks to Parzival for QA!