Adding blue border to the selected object; currently adds a border
to ALL objects until logic is sorted. May have to redraw or
repaint in order to remove blue border from previously selected
object.
Instead of setting borders, everytime a Repr object is dropped onto
the canvas, its colour is set. Colour is only set on items that
have * been * selected, not the one that is currently selected.
Fixed selection indicator, left click logic was being invoked on
right click (custom context menu). Added check to make sure the
selected item couldn't be unselected with a right click as it was.