JNI refactor

Somewhat significant JNI update. Make sure to use the LLVM-RS-CC patch.
As of now, I do not have the OSX binaries uploaded. IF YOU WANT TO BUILD
THIS ON OSX FOR THE TIME BEING, delete the following file :

/jni/rsNDK/NDKkernels.rs

ALSO, remove all references to:

ScriptC_NDKkernel

^ this is declared in /jni/Initialize/Initialize.hpp
comment out references to this, and also make sure that you comment out:

#include <rsNDK/ScriptC_NDKkernel.h>

^ which should only be in /jni/rsNDK/rsNDK.hpp