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Originally from build #463

Changes

1. X11Util: Catch X11 Error on XCloseDisplay (details / cgit)
2. *GLContext: resetStates(); getPlatformExtensionsString(); GLX/WGL NV_swap_group support; setSwapInterval(); (details / cgit)
3. NEWT: Window default pos ; FullScreen (details / cgit)
4. test scripts (details / cgit)