DictionaryManagerService - Explicitly close cursor

If the cursor is not closed, there is a warning about the finalizer
being called before cursor was closed.
FloatingJapaneseDictionaryService - rename parameters window_id to id

The underscores look bad and I am no longer confused
about what id refers to.
FloatingJapaneseDictionaryService - remove unnecessary final modifiers

Remove final modifiers from parameters.
DictionarySearcherActivity - Clarify comment about SUBMITTED flag

I didn't understand it after a month.
FloatingJapaneseDictionaryService - add Lookup

Add a new dropdown item, Lookup, which performs a web
search of the current query.
DictionarySearcherActivity - trim query before searching
FloatingJapaneseDictionaryService - add mode CLEAR_TEXT

Right now CLEAR_TEXT does nothing as the display
is cleared before processing the received data.
DictionarySearcherActivity - Send CLEAR_TEXT if query is empty

This means that we no longer display "No Results" if
the query was empty because the query was
deleted during search-on-type.
FloatingJapaneseDictionaryService - add space to log message
Describe Lookup in Readme