Introduce SuggestedWords class to represent suggestions list

java/res/layout/candidate.xml

java/src/com/android/inputmethod/latin/CandidateView.java

java/src/com/android/inputmethod/latin/LatinIME.java

java/src/com/android/inputmethod/latin/Suggest.java

java/src/com/android/inputmethod/latin/SuggestedWords.java

.../src/com/android/inputmethod/voice/VoiceIMEConnector.java

tests/src/com/android/inputmethod/latin/SuggestHelper.java