Move resource related methods to ResourceUtils

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

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

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

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

...id/inputmethod/latin/suggestions/SuggestionStripView.java