Keyboard class is missing PrintScreen button/key code

[JFixby]

https://github.com/LWJGL/lwjgl/blob/master/src/java/org/lwjgl/input/Keyboard.java

Also: pushing PrintScreen on a keyboard produces keyCode = 183 in Windows 8.1

[Spasi]

See KEY_SYSRQ, it's the same key.