Refactor SubtypeLocale to hold Resources

...rc/com/android/inputmethod/keyboard/MainKeyboardView.java

.../android/inputmethod/latin/AdditionalSubtypeSettings.java

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

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

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

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

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