Lightweight Java Game Library Code

Linux: Improve input latency by processing X messages from nPoll and nRead

Linux: improve cursor position handling (warp behaviour)

Linux: Implemented support for Extended Window Manager Hints. LWJGL now cooperates
much better with the window manager, if the X randr and EWMH extensions are supported.
Especially fullscreen handling has improved, by avoiding the use of the override_redirect
flag.

Win32 part of fast Pbuffer

Implemented new type of Pbuffer that use the Display context, which is faster than a separate context (Linux)

Fix indentation

Move native stub initialization from extgl into GLContext.java. Makes it much easier to
exlude extensions classes. Furthermore, GLContext.useContext(null) can now be used to
reset the native stubs when no context is current.

Linux part:

Merged Window and Display into org.lwjgl.Display
Added support for persistent context. This will enable LWJGL games
to avoid recreating the context resources like textures and display
lists when switching between windowed and fullscreen and/or context
dimensions.

Added PixelFormat class instead of individual parameters to Display.create
and Pbuffer constructor.

header unification

Linux: Implemented proper X async error handling