Refactor the crap out of Utensil object
Remove -1, -1 coordinate initialization (code in exceptions soon)
Remove unnecessary listeners
Remove unused constructors in Utensil class
Throw UnsupportedShapeException
Suppress a warning in UnsupportedShapeException
Move UnsupportedShapeException to exceptions package
Remove getCoordinates method from Utensil
Remove coordinates instance var from Utensil
Add Eraser Utensil
Add Utensil-y JavaPaintGui constructor