Shutdown unused cameras

If the preview display is hidden, or if ManyCam is minimized, it would be nice if ManyCam would only activate the cameras that are currently being served to applications requesting them.

Right now it activates all of cameras linked to all profiles and by the increased CPU usage i believe that it is processing all of that video too.

Supported… ManyCam is a major CPU and Memory hog… there is no reason to keep all the videos running even when they are not being streamed.

@Anonymous, thank you.