Android: Implement Java exception handling, make sure all return values from JNI are sane. This allows you to break in _dw_jni_check_exception() on or before return TRUE to catch any Java exceptions, otherwise they will be cleared and the functions will return failure. Fix the NullPointerException from the last commit, it was in windowGetData with a non existant key in the data SimpleArrayMap.

# Set these here to change the version for all platforms
DW_MAJOR_VERSION=3
DW_MINOR_VERSION=2