Move code point constants from Keyboard to Constants class

...d/inputmethod/accessibility/KeyCodeDescriptionMapper.java

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

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

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

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

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

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

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

...droid/inputmethod/keyboard/internal/KeyboardCodesSet.java

...android/inputmethod/keyboard/internal/KeyboardParams.java

.../android/inputmethod/keyboard/internal/KeyboardState.java

...om/android/inputmethod/keyboard/internal/MoreKeySpec.java

...roid/inputmethod/latin/AudioAndHapticFeedbackManager.java

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

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

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

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

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

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

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