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This adds a HUD that shows player's input controls.  This is especially
useful for livestreaming or demo videos, where you might want to show
players what exact set of control inputs is used to execute some
specific action.

It's run by the server, so there may be some latency; it performs best
in single player or LAN games.

Use "/controhud #" to set the size scale to #, where # is a number
of value zero or greater.  A value of zero hides the HUD.

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