Move constants to a better place.

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

...m/android/inputmethod/latin/ContactsBinaryDictionary.java

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

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

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

...c/com/android/inputmethod/latin/UserBinaryDictionary.java

.../com/android/inputmethod/latin/UserHistoryDictionary.java

...rc/com/android/inputmethod/latin/WhitelistDictionary.java