recreate java3_Lesson07
overwrite Lesson 7 with Homework 6 files
add Rectangle
add Oval
add ShapeMouseHandler
add ShapeMouseHandler to GUIDemo
add mouseDragged() event to ShapeMouseHandler
add ButtonPanel
add ControlsPanel
add the reset value for currentShape to the Model class
add java3_Homework07
update createShape
add Triangle
add Line