Separate state from proximity_info step1

java/src/com/android/inputmethod/keyboard/ProximityInfo.java

native/jni/Android.mk

native/jni/src/correction.cpp

native/jni/src/defines.h

native/jni/src/proximity_info.cpp

native/jni/src/proximity_info.h

native/jni/src/proximity_info_state.cpp

native/jni/src/proximity_info_state.h

native/jni/src/unigram_dictionary.cpp