REACH-123 Add view for String node

Send correct value of a String node to Flood
Thanks Maria, this change looks great! The only thing is, I had to refer to MSDN documentation to realize that ```double.TryParse``` and ```bool.TryParse``` actually resets the default values to ```0.0``` and ```false```, respectively. In order to make this clearer, I would suggest we do the same as the old way (before your code changes) so the intent is clear:

```csharp
double number;
Value = double.TryParse(data, out number) ? number : 0;
```

Does that make sense? Or do you have your own reasoning for this?