TextBox

1) TextBox has method to hide and show the textbox: hideText(),
showText()
2) has methods for straight progression through dialogue trees, and for
picking a random sentence out of the dialogue: straightProgression(),
randomProgression()
3) MainWindow has a textLevel variable for the textBox
4) Hitting the S, R, and H keys activate straightProgression(),
randomProgression(), and showText()/hideText() respectively