Allow to open links into new window by ctrl and left mouse.
Fixed hints not opened in new window on duckduckgo (#59).

There are some pages that use mouse event observers that open link href
programmatic and ignore the target attribute that vimb uses to open link into
new window. So this patch fires the click related mouse events with the
additional set CTRL key that is considered by those scripts and also other
browsers to open the resource into new window.