Rename BinaryDictEncoder to BinaryDictEncoderUtils.

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

...id/inputmethod/latin/makedict/BinaryDictEncoderUtils.java

...android/inputmethod/latin/makedict/BinaryDictIOUtils.java

.../inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java

...droid/inputmethod/latin/utils/UserHistoryDictIOUtils.java

...tmethod/latin/makedict/BinaryDictDecoderEncoderTests.java

...id/inputmethod/latin/makedict/BinaryDictIOUtilsTests.java

...m/android/inputmethod/latin/dicttool/DictionaryMaker.java

...tmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java

...hod/latin/makedict/BinaryDictEncoderFlattenTreeTests.java