Allow accessing settings of known wifi networks
Currently it is only possible to access the settings for the currently connected wifi network. Being able to configure a wifi network, even though it is not connected, would be useful for example to share the password for a network that is not in range.
To achieve this, a new property was added to CcWifiConnectionRow. The new property "known_connection" signals whether this connection is known and thus whether the options button for configuring it should be displayed.
The property "known_connections" will be set to TRUE in two cases:
- when the list of connections is shown in the "Known Networks" dialog
- when the connection is known, but not the active connection
Closes #1906 (closed)