fdo#46808, shiny UNO conversion: would be nice to have some additional helper methods

Hi

I'm starting on this again:
https://bugs.freedesktop.org/show_bug.cgi?id=46808

Large chunks of the work are pretty mechanical, but it would make work 
much easier if the auto-generated C++ had some additional helper methods.


(1) Down-conversion implicit conversion operators for converting from an 
interface to it's sub-interfaces.
Which would help me replace this:
        uno::Reference < i18n::XBreakIterator2 > xB2 = 
i18n::BreakIterator2::create(xContext);
        uno::Reference < i18n::XBreakIterator > xB1 = 
uno::Reference<i18n::XBreakIterator>(xB2, uno::UNO_QUERY_THROW);
with this:
        uno::Reference < i18n::XBreakIterator > xB1 = 
i18n::BreakIterator2::create(xContext);
to simplify code when converting from the new interfaces to the old 
interfaces, which happens a lot
because I don't want the changes to ripple out.

(2) A new version of the factory create method that uses the current 
process component context.
i.e. instead of
        uno::Reference< i18n::XBreakIterator > xLocalBreakIterator;
        uno::Reference< uno::XComponentContext > 
xContext(::comphelper::getProcessComponentContext());
xLocalBreakIterator.set(i18n::BreakIterator2::create(xContext));
I could write:
        uno::Reference< i18n::XBreakIterator > xLocalBreakIterator;
xLocalBreakIterator.set(i18n::BreakIterator2::createWithProcessContext());


Thanks,
    Noel Grandin

(yes, I do indeed pride myself on being a very lazy programmer :-)

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