dbus based sync and async api both works.
- added error handler for dbus client in emacs lisp.
- use lexical-binding for all files
- added M-x zero-reload-all this will byte compile and reload file files.

easier to read and eaiser to write.

make partial commit work with zero-pinyin.el
added a few "virtual functions" in zero-framework.el
removed SPC key in keymap, just use self-insert-command remap.