Add support for bidirectional array transforms.

Array transforms can now be created with an inverse functor, allowing for casts back into the native array type. As a result, array transforms with both a functor and inverse functor defined can perform read and write operations. As an example, ArrayHandleCast now supports this operation. The original implementation of ArrayHandleCast (i.e. read only) has been renamed 'ArrayHandleCastForInput'.