update number of passing tests
test setParent and getParent
implement TextEditor.setPosition; move canvas to top-left corner
multiline should be false by default
comment about possible additional work to do
test multiline status
implement get/setBackground/ForegroundColor
make TextEditor.getLineMarginHeight and .getContentHeight more correct
move display back to right side of screen
implement CanvasItem.getPositionX/Y; move .setPosition to CanvasItem