Plan Configuration Wizard

How to implement

Change on fcitx side

1. modify fcitx-configtool, add ability for detecting all supported tool exist or not.

2. use freedesktop notification to display a message on first run.

3. invoke fcitx-configtool wizard.

Change on kcm-fcitx and configtool side

Implement on wizard argument to launch a wizard.

Wizard contains some hint about how to use, change the prefered input method list, and something more maybe?