private void addString(String str) {
        if (strTable.containsKey(str)) {
            return;
        }
        StringItem stringItem = new StringItem(str);
        strTable.put(str, stringItem);
        strTable0.add(stringItem);
    }
Write pkgs to an arsc file

@author bob
@see ArscParser
android/third_party/apkbuilder/src/main/java/pxb/android/arsc/ArscWriter.java