score banner incorporation

Demo:
-set GameWindow up with sizing to accomodate the score banner

GameWindow:
-added scoreArea to store score positioning
-score construction moved to setArea() to support sizing
!will reset score whenever setArea() is called
-setArea() updated
+positions updated to include score banner

Score:
-partial resizing support
+added width, height property
+removed reliance on window dimensions
!not fully honoured by draw()
-added constructor taking sizing parameter