Lightweight Java Game Library Code

Fixed null pointer exception in AppletLoader caused by cleaning up resources in the middle of a paint call. Thx to NateS for point this out and suggesting the fix.

fixed issue with empty java_arguments by switching to lwjgl_arguments param name instead

add support for passing in lwjgl specific properties via java_arguments applet parameter

fix minor typo in javadoc/comments

Added clSetKernelArg support for CLObject and __local arguments.

Reverted @CachedReference tracking removal.

Fixed ELEMENT_ARRAY_BUFFER_BINDING tracking when VAOs are used.
Removed CachedReference tracking, we never check those.

remove debug code left in WindowsDisplay, thx to MatthiasM.

adding support for zeroing buffers - patch'ish by MatthiasM

Changed initial alpha value of glClearColor from 1 to 0 which is set when Initialising the Display. This now matches expected OpenGL behaviour. Thanks to Ryanm for spotting this. If you use FBO's make sure your setting glClearColor properly.