Rename and reorganize key code

java/res/values/keycodes.xml

java/res/xml-xlarge/kbd_key_styles.xml

java/res/xml/kbd_key_styles.xml

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

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

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

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