Move key hysteresis distance parameter to KeyDetector class

java/res/values/attrs.xml

java/res/values/styles.xml

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

...m/android/inputmethod/keyboard/LatinKeyboardBaseView.java

...android/inputmethod/keyboard/MiniKeyboardKeyDetector.java

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

...inputmethod/keyboard/internal/PointerTrackerKeyState.java

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