Handle Accessibility Differences in Property Accessors Correctly

To reproduce:

```csharp
public class PropertyAccesibilityDifferences
{
  public virtual Type DestinationType { get; protected set; }
}
```

Rocks will generate this such that the `get` and `set` are both `public`, and this is incorrect.

This came from `AutoMapper.PropertyMap` - specifically the `DestinationType` property.