[vb6] Use variants for passing arrays to and from classes

An array can be packed in a single variable of type variant. This goes for arrays of any datatype except user-defined types and fixed-length strings. The variant can then be passed to and from functions and subs, e.g.
In a calling procedure:

    Dim B(20) as Byte
    Dim V as Variant
    V = B
    'Call the sub "MySub"
    MySub (V)
    '-----------------
    'In MySub:
    Dim Bb() as Byte
    Dim Vb as Variant
    Bb = Vv
    'The Bb array is redimensioned automatically. 

Similarly, the variant can be passed back in the form of function result.