New state format without IDs

[ffMathy]

Syntax proposal:

{
    "tests": [
        {
            "name": "Foo.Tests.Bar",
            "coverage": [
                {
                    "path": "C:/foo.cs",
                    "lines": [1, 2, 3]
                },
                {
                    "path": "C:/foo2.cs",
                    "lines": [1, 2, 3]
                }
            ]
        },
        {
            "name": "Foo.Tests.Bar2",
            "coverage": [
                {
                    "path": "C:/foo.cs",
                    "lines": [1, 2, 3]
                },
                {
                    "path": "C:/foo2.cs",
                    "lines": [1, 2, 3]
                }
            ]
        }
    ]
}