Lightweight Java Game Library Code

Implemented reference counted loading of gl library in java

Added more error checking in OpenAL. Unload native stubs on AL destroy.

all initNativeStub() methods throws LWJGLException

Moved openal native stub loading to java

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.

Removed obsolete LWJGL_SANITY_CHECK and extgl_error

Split WGL out to extgl_wgl.cpp/h

Win32 part of Display/Window merge

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