Check for firmware updates

[meisenzahl]

Problem

I found out yesterday by accidentally opening the firmware page in the system settings that there are updates for my hardware. Since firmware updates sometimes close critical security gaps, I think it is important that the user is informed about possible updates.

Proposal

Check once a day if firmware updates are available and notify the user.

Prior Art (Optional)

No response

[danirabbit]

Transferring to settings-daemon since we had talked about solving it there

[danirabbit]

Fixed in #45