Add font size controls to test app.
Add font size controls to test app.

seeminglee/pyglet64,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,seeminglee/pyglet64,niklaskorz/pyglet,niklaskorz/pyglet,seeminglee/pyglet64,niklaskorz/pyglet