VB to C#: convert VB-style optional arguments

[dgrunwald]

SD-1824, originally created on 4/7/2011 13:59:22 by Daniel Grunwald

Both for method calls:
Method(1,,,4)

and for attribute arguments:
<MyCustomAttributeClass(1,,4)> Public Property SomeProperty() as
String

The VB->C# converter needs to convert all the arguments after the
first empty spot into named arguments.