Move case and OOV detection logic into distracter filter.

.../com/android/inputmethod/latin/DictionaryFacilitator.java

...com/android/inputmethod/latin/utils/DistracterFilter.java

...s/DistracterFilterCheckingExactMatchesAndSuggestions.java

...d/latin/utils/DistracterFilterCheckingIsInDictionary.java

...m/android/inputmethod/latin/utils/LanguageModelParam.java

...android/inputmethod/latin/utils/DistracterFilterTest.java