Show the game window on a seperate computer

[joshzcold]

Now a joining player can "Open Game Window" to become a "spectator" which is just the /game page that the admin usually can open.
This allows showing the game on a seperate browser/machine.

The Spectator window can "quit" to get back to the index page.

#88

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This discussion was created from the release Show the game window on a seperate computer.