Introduce ping event

Scott Moreau oreaus at
Mon Apr 16 10:25:38 PDT 2012

This series introduces a ping event to check if clients are alive.
It also introduces brightness and saturation for the surface shader.
If a client has not responded to a ping when the timeout is reached,
it is deemed unresponsive and fades the surface's brightness and
saturation. The dimming is undone if the client later begins to respond.

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