Additional argument for toArray() to ignore hidden rows/columns

[MarkBaker]

I'm doing some work on improving the presentation of the samples, and at the moment I'm working on the AutoFilter examples.

It got me thinking: how useful would it be for the toArray() methods (including rangeToArray() and namedRangeToArray()) to accept an additional argument that indicates whether hidden rows and columns should be returned, or not.
Default behaviour should remain "as is", including hidden rows/columns in the returned array.

Note that it's already very simply to code using the row/column Iterators to ignore hidden rows/columns; but toArray() doesn't have this option at all.

See PR #3494 for the proposed change