Replace up-casting conversion constructor with respective conversion operator,
similar to existing css::uno::Reference conversion operator. Thic change will
not allow code like
rtl::Reference<Foo> foo;
rtl::Reference<Foo> bar(foo, uno::UNO_QUERY_THROW);
which was possible because compiler could use temporary css::uno::Reference.
Change-Id: I54b79af3e2508b26e9cd59f2cc7e2ae92f6efbbf
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/171166
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
18ed2be7f1