This is particularly useful for creation of sequences that are later
unwrapped using comphelper::SequenceAsHashMap.

Eg.

    uno::Sequence<uno::Any> aArguments(comphelper::InitAnySequence(
    {
        {"SomethingNamed", uno::makeAny(true)},
    }));

    Reference<XExporter> xExporter(aFactory->createInstanceWithArguments(..., aArguments), UNO_QUERY);

and in the implementation:

    comphelper::SequenceAsHashMap aArgumentsMap(rArguments);
    mbSomething = aArgumentsMap.getUnpackedValueOrDefault("SomethingNamed", false);

Change-Id: Ib1135078a99ca08f50bf51184f2ec7d13f5e6b4d
Reviewed-on: https://gerrit.libreoffice.org/40194Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>