Merge "Move word flags to language model dict content."

...i/src/suggest/core/dictionary/property/unigram_property.h

...nary/structure/v4/content/language_model_dict_content.cpp

...ionary/structure/v4/content/language_model_dict_content.h

...yimpl/dictionary/structure/v4/content/probability_entry.h

...olicyimpl/dictionary/structure/v4/ver4_dict_constants.cpp

.../policyimpl/dictionary/structure/v4/ver4_dict_constants.h

...ictionary/structure/v4/ver4_patricia_trie_node_writer.cpp

.../dictionary/structure/v4/ver4_patricia_trie_node_writer.h

...mpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp