Decouple game logic updates from render update.

Signed-off-by: John McCutchan <john@johnmccutchan.com>
Call pointer lock change callback.

Signed-off-by: John McCutchan <john@johnmccutchan.com>
Update year on license.

Signed-off-by: John McCutchan <john@johnmccutchan.com>