Implement ver4 dict PtNode reading methods.

native/jni/Android.mk

...olicyimpl/dictionary/structure/pt_common/pt_node_params.h

...ctionary/structure/v3/dynamic_patricia_trie_node_reader.h

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

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

...ictionary/structure/v4/ver4_patricia_trie_node_reader.cpp

.../dictionary/structure/v4/ver4_patricia_trie_node_reader.h

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

...yimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h

...tionary/structure/v4/ver4_patricia_trie_reading_utils.cpp

...ictionary/structure/v4/ver4_patricia_trie_reading_utils.h

.../android/inputmethod/latin/Ver4BinaryDictionaryTests.java