Header cleanup. Moved a couple of functions from .h to .cpp.

native/jni/src/binary_format.h

native/jni/src/char_utils.cpp

native/jni/src/correction.cpp

native/jni/src/correction.h

native/jni/src/defines.h

native/jni/src/dictionary.cpp

native/jni/src/dictionary.h

native/jni/src/proximity_info.cpp

native/jni/src/proximity_info_state.cpp

native/jni/src/proximity_info_state.h

native/jni/src/unigram_dictionary.cpp

native/jni/src/words_priority_queue.h