Lightweight Java Game Library Code

let extgl_Open throw the exception to gain more information about the failure

Linux: removed redundant last_z from Mouse.c. Mac: Compile fixes. Use NSAddImage for loading GL library

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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

Cleanup

Added some new extensions

New extensions and static import modifications