Refactor and rename popup mini keyoard related classes

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

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

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

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

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

...m/android/inputmethod/keyboard/PopupMiniKeyboardView.java

...id/inputmethod/keyboard/internal/MiniKeyboardBuilder.java

...ndroid/inputmethod/keyboard/MiniKeyboardBuilderTests.java