Lightweight Java Game Library Code

Linux: Replaced obsolete hasFocus with isFocusOwner

Mac OS X: Moved mouse handling from MacOSXDisplay to MacOSXMouseEventQueue

Mac OS X: Fixed null delta_buffer in MacOSXMouseEventQueue

Added org.lwjgl.opengl.AWTInputAdapter which enabled use of Mouse and
Keyboard with AWTGLCanvases. Programs can now avoid implementing AWT input processing and access the mouse grabbing features from both Display and AWTGLCanvas. See org.lwjgl.test.opengl.awt.AWTInputAdapterTest for an example.

Note: This commit is the linux and generic AWT imlementation and can still
change a lot while implementing windows and mac os x.

Don't register the Display shutdown hook in the static initializer. Register it at create() and remove it at destroy(). This avoids unnecessary conflicts when only using AWT stuff

Mac OS X: Moved registering and unregistering of AWT listeners from MacOSXDisplay to the input handlers

Mac OS X: Moved AWT input handling to separate AWTUtil.java

Removed redundant import

Linux: Made cursor handles longs instead of ByteBuffers

Linux: Added locking to LinuxMouse