Resolves: #911487 - Non-Chinese tables from the ibus-table-other package do not work
    
    - Update cmode property in chinese mode only
    
    And some other small fixes and improvements:
    
    - Add auto_select functionality to select the first phrase when typing.
      Useful for Cyrillic transliteration
    - Fall back to auto_select = False if neither dconf nor the table
      have a value for auto_select
    - Preedit needs to be updated on page-up and page-down