Add support for defining how to color items based on which rule matches

[errnoh]

As the title says, this allows defining different colors for different rules.

Main question that's left is probably if things like color and future alert (or whatever it ends up being named) should be like they are now or separated a bit... something like:

    {
        "store": "marks",
        "color": "white"
    }

vs

    {
        "store": "marks",
        "meta": { 
          "color": "white"
        }
    }