Lightweight Java Game Library Code

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

LINUX: Improved input handling

LINUX: Fixed warp ignores

LINUX: Implemented setGrabbed

LINUX: Implemented reference counted display connection to let Cursors be created and destroyed without a window or a mouse

Split GLX from extgl into separate platform specific extgl_glx