Support "Add Array Item" for Array of Structs in .NET code modules

[mavimi]

Currently there is only the "Create type from struct" button available, when there is an parameter, that requires an array of structs, in a .NET call

What would be nice, is to have the features available, that are available when passing clusters to labview:

That is: 

• The Add Array Item button
• The Delete/Delete All Item buttons
• The feature of 'uncollapsing' a struct and setting the values for each field in the struct.