Separate header class from FormatSpec.

...com/android/inputmethod/latin/BinaryDictionaryGetter.java

...android/inputmethod/latin/ExpandableBinaryDictionary.java

...tmethod/latin/debug/ExternalDictionaryGetterForDebug.java

...droid/inputmethod/latin/makedict/AbstractDictDecoder.java

...id/inputmethod/latin/makedict/BinaryDictDecoderUtils.java

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

...c/com/android/inputmethod/latin/makedict/DictDecoder.java

.../android/inputmethod/latin/makedict/DictionaryHeader.java

...rc/com/android/inputmethod/latin/makedict/FormatSpec.java

...m/android/inputmethod/latin/makedict/Ver2DictDecoder.java

...m/android/inputmethod/latin/makedict/Ver4DictDecoder.java

...m/android/inputmethod/latin/makedict/Ver4DictEncoder.java

...rsonalization/DecayingExpandableBinaryDictionaryBase.java

.../android/inputmethod/latin/utils/DictionaryInfoUtils.java

...roid/inputmethod/latin/BinaryDictionaryDecayingTests.java

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

...m/android/inputmethod/latin/makedict/BinaryDictUtils.java

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