plug v0.8.13

Changed

• The menu bar panel has a Plug on/off switch, separate from Quit. Turning
  off confirms that connected apps lose access, stops the app-owned background
  service, and stays off across launches. Turning on restores the service.
  Quit only closes the menu bar app and leaves a running service alone.
  Recent-call durations keep their full width beside long tool names.

• Apps uses the current session list for connected state and counts. A stale
  app scan no longer invents a connected app or keeps an old session count.

• The window has three sections: Servers, Apps, and Activity. Tools moved
  into the server they belong to: Servers shows the list on the left and the
  selected server in full on the right, with its tools and their switches.
  Searching in Servers finds tools as well as servers, and clicking a tool
  shows its details beside it. A server's header carries Restart, Edit, and
  an on/off switch. Connections is now called Apps.

• Apps groups by what matters first: Connected now, On this Mac, and Remote
  clients. A connected app opens to show each of its sessions with its id,
  how long it has been open, and how many tools it can reach. A remote
  client shows the site it signs in from, or a short id, in place of its
  registration method.

• The menu bar panel lists the three most recent tool calls, with the server,
  the outcome, and how long each took. Clicking them opens Activity.