Feature Request: Allow stateful to RUN command/pass state TO command.

[mralexgray]

Currently, if set to statueful.. the command does not run.

Also, it would be nice if we could access the state of the stateful switch FROM the executed command.

For example

"accessories": [
	    {
	        "accessory": "CmdTrigger",
	        "name":      "Stafeful Switch",
	        "command":   "echo $1 ",
	        "stateful":   "true",
	    }
    ]

[laserscout]

Added the feature on pull request !13