Embind: throwUnoException from JS
(If throwUnoException directly took a css::uno::Any argument, JS client code
would need to create one with `new Module.uno_Any(...)` and call .delete() on
it, but there is no place where it could call .delete(), so make
throwUnoException take two arguments instead and assemble the css::uno::Any on
the C++ side.)
Change-Id: Iae4ae6af804354d5cf752115e272b79d61427440
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/166253
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>