Get rid of Key.setIcon(Drawable)

java/res/values/attrs.xml

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

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

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

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

...droid/inputmethod/keyboard/internal/KeyboardIconsSet.java

...ndroid/inputmethod/latin/suggestions/MoreSuggestions.java

...oid/inputmethod/keyboard/internal/KeySpecParserTests.java