network: add NMConnection and NMConnectionContext

[cpwrs]

WIP. Exposes the full connection settings from NetworkManager and a connection context to know when secrets are needed or connections failed.

• Moved a few general WifiNetwork properties/invokables to its parent Network
• Fixed unmanaged Devices. All devices are now exposed and have a writable managed property.
• Added NMConnection
  • Added settings, secretSettings, and id properties
  • Added updateSettings, clearSecrets, and forget invokables
  • Add setWifiPassphrase invokable
• Added Network.nmConnections and Network.nmDefaultConnection
• Add NMConnectionContext
• Improve docs (make secret storage logic clear)

[outfoxxed]

noticing you formatted it, is this ready now?

[cpwrs]

noticing you formatted it, is this ready now?

Not yet, gotta add back some password stuff. I have time to work on it today