If an `IContainer` contains `IObjects`, current implementation does not wrap them after unpacking even if `WrapNonBHoMObjects` is set to true

[alelom]

Description:

As title, this is due to the checking for BHoMObjects happening before the unpacking. Connected to #351.

Fixable in the same way as #351.

Steps to reproduce:

As above.

Expected behaviour:

Should be possible to wrap IObjects in IContainers.

Test file(s):

See #351

[alelom]

Closed by #351