nifty-renderer-jogl2: Switch AWT -> NEWT

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>
JOGLNiftyRunner: Exit application at dispose of window.

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>
JOGL: add ES2 support to the core batched renderer