Issue 334: check no modifiers present for ESC close window shortcut
Issue 334: check no modifiers present for ESC close window shortcut

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