Added ability to define effect arguments for the bootsequence

By adding a json object "args" to "bootsequence".

For example:

`"bootsequence" :
        {
                "effect" : "Knight rider",
                "duration_ms" : 5000,
                "args" :
                {
                        "color" : [0,255,0] ,
                        "fadeFactor" : 0.9 // "speed" is not set here. But effect engine uses the default values.
                }

        }
`