network: Implement the new connection editor Design

Closed Adrien Plazas requested to merge (removed):wip/aplazas/connection-editor into master

This implements most of the new design for the connection editor:

My goal was to mostly change the UI but not the logic behind it as it seems to work well, to avoid breaking things. I took care of testing it with VPNs, wired networks, Wi-Fi…




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