Cleanup suggest interface

native/jni/Android.mk

native/jni/src/dictionary.cpp

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

...est/policyimpl/gesture/gesture_suggest_policy_factory.cpp

...ggest/policyimpl/gesture/gesture_suggest_policy_factory.h

...i/src/suggest/policyimpl/typing/typing_suggest_policy.cpp

...suggest/policyimpl/typing/typing_suggest_policy_factory.h

native/jni/src/suggest/typing_suggest.h