Give tag /*NXLT*/ for dynamo core

@ke-yu @Benglin  I have finished giving tag /*NXLT*/ for DynamoCore project. Please take a look 
The above 4 need translation (and note that you didn't have ```/*NXLT*/``` for ```step``` and ```end```). For that I'd recommend this way:

```csharp
if (valueRange.Length > 2)
    throw new Exception("Range step could not be parsed.");
else 
    throw new Exception("Range end could not be parsed.");
```

So that it is easier for localization.