Json field names in CamelCase

With my rusty C skills I managed to add a camelCaseForJson method that will convert all pgn.description and field.name values to CamelCase, stripping all non-alpha and non-digit characters. If interested you can uncomment the printf line to see how things change.

The goal is to be able to use
```
foo.WindAngle
```
instead of the less readable
```
foo['Wind Angle']
```

I think there is a free missing there someplace, but the conversion is done only once I figured things could work ok like this.