Move some dictionary related implementations to the dictionary directory

native/jni/Android.mk

...ve/jni/com_android_inputmethod_latin_BinaryDictionary.cpp

native/jni/src/bigram_dictionary.cpp

native/jni/src/suggest/core/dicnode/dic_node.cpp

native/jni/src/suggest/core/dicnode/dic_node.h

...ve/jni/src/suggest/core/dicnode/dic_node_priority_queue.h

native/jni/src/suggest/core/dicnode/dic_node_properties.h

native/jni/src/suggest/core/dicnode/dic_node_state.h

...ve/jni/src/suggest/core/dicnode/dic_node_state_prevword.h

native/jni/src/suggest/core/dicnode/dic_node_state_scoring.h

native/jni/src/suggest/core/dicnode/dic_node_utils.cpp

native/jni/src/suggest/core/dicnode/dic_node_vector.h

native/jni/src/suggest/core/dicnode/dic_nodes_cache.cpp

native/jni/src/suggest/core/dicnode/dic_nodes_cache.h

native/jni/src/suggest/core/dictionary/binary_format.h

native/jni/src/suggest/core/dictionary/bloom_filter.h

native/jni/src/suggest/core/dictionary/dictionary.cpp

native/jni/src/suggest/core/dictionary/dictionary.h

native/jni/src/suggest/core/dictionary/digraph_utils.cpp

native/jni/src/suggest/core/dictionary/digraph_utils.h