[kcm/mobilewifi] Rework actions
The current usage of Kirigami actions has some problems.
We do not use Kirigami actions in other KCMs. They only work in plasma-settings, but not in systemsettings. Not a huge deal in this particular case though. Using the main action for dis/enabling wifi always felt a bit weird to me. There was no clear indication what the button does There is also lacking some indication that wifi is disabled.
This patch:
- Adds a placeholdermessage that informs that the wifi is disabled and offers to enable it
- Adds a footer with more actions, including disabling the wifi. This is where we usually put actions in a KCM