1. add two items into “conf”
    o Toggle
    o File path

  2. check if the export is enabled before exporting to file in mainwin and floatwin

  3. add extra UI for exporting options
    o dictionary/enable_export_event
    o dictionary/export_file

TODO list:

  1. keyboard shortcut
  2. drop-down list for inputed file paths ( good for switching )
  3. exported notification on screen