The test for binary dictionary will soon entail decrypting and
uncompressing files if necessary to test for their headers, and will
become much slower than it is. It's better to be able to detect the
XML format too, and leave the slower test for last.
Bug: 7388852
Change-Id: I6b9a7944de80217e1571cab65dcd1cff347b3046
This introduces a new textual format for the dictionary that combines
words, bigrams and shortcuts to avoid complexity. It is also extensible
to n-grams to fool-prof for the future, and easier to read than XML.
Bug: 7388540
Change-Id: I942bbad51bd0c905a5a54c278667563fd6dd66ec
