Split Utils class to StringUtils, SubtypeUtils, and JniUtils

...d/inputmethod/compat/InputMethodManagerCompatWrapper.java

java/src/com/android/inputmethod/deprecated/VoiceProxy.java

...d/deprecated/languageswitcher/InputLanguageSelection.java

...android/inputmethod/deprecated/voice/RecognitionView.java

java/src/com/android/inputmethod/keyboard/Key.java

java/src/com/android/inputmethod/keyboard/KeyboardSet.java

java/src/com/android/inputmethod/keyboard/KeyboardView.java

...c/com/android/inputmethod/keyboard/LatinKeyboardView.java

...rc/com/android/inputmethod/keyboard/MoreKeysKeyboard.java

java/src/com/android/inputmethod/keyboard/ProximityInfo.java

.../android/inputmethod/keyboard/internal/KeySpecParser.java

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

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

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

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

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

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

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

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

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