- bugfix on zero-input-pinyin: sometimes after GetCandidate dbus call,
  zero-input-fetch-size and zero-input-candidates is not updated. This
  was because the async function callback didn't update the metadata in
  some places.
- zero pinyin supports sync and async mode.
  to switch between them, run
  M-x zero-input-pinyin-enable-async
  M-x zero-input-pinyin-disable-async

support space char in full-width mode.

and zero-input-toggle alias.

zero-input-toggle-full-width-mode > zero-input-toggle-full-width

- dropped Package-Version metadata.
- zero-input-full-width-mode renamed to zero-input-full-width-p.
- zero-input-toggle is now an obsolete alias for zero-input-mode.
- use `defvar-local' when variable is always buffer local.
- moved test data to debug/test files.
- fixed typo. zero-input-pinin-service > `zero-input-pinyin-service'.