fs: deglobalise the config #4685

This is done by making fs.Config private and attaching it to the
context instead.

The Config should be obtained with fs.GetConfig and fs.AddConfig
should be used to get a new mutable config that can be changed.

cmd/config/config.go

@@ -43,7 +43,7 @@ password to protect your configuration.
 `,
 	Run: func(command *cobra.Command, args []string) {
 		cmd.CheckArgs(0, 0, command, args)
-		config.EditConfig()
+		config.EditConfig(context.Background())
 	},
 }