Added TrackNumber and Year to the data fetched for each tracks by TrackInfo

Simply.

There are a bunch of fields I wanted to add.. but I see another place that loops through JSON kinda manually and adds fields (in function `SearchAllAccessTracks`).. This one would need a little refactor before being able to handle that properly.   It could look something like this:

```
var data struct {
    Entries []struct {
        Type string
        Track Track
    }
}
err = json.Unmarshal(searchResponse, &data)
```

then we can, all statically, we can get the Type and append only the `Track` instances we want.