feature request: toggle exit node on/off by right clicking tray icon.

[rkraken]

I use Mullvad VPN as an exit node but I'm constantly having to disconnect for certain sites that block vpn access. It would be really convenient if I could enable/disable from the tray icon.

In the past I just did a disconnect tailscale from the tray icon, but then I don't have access to my LAN services such as saving a pdf document from that problem website, to an nfs mounted disk.

As a bonus if the color of the icon changes depending on state (exit node on/off and also tailscale on/off), it would be really convenient, as I often forget to reenable the exit node when I'm done.

Thank you!

[DeedleFake]

This is mostly a duplicate of #67, except for the color of the icon changing. The icon does currently change shape based on an exit node being in use.

[rkraken]

For some reason I never noticed the icon changing shape based on exit node status. Thank you.