Support for multiple targets in qt_add_{lupdate,lrelease,translations}

It's common for applications to be spread over multiple targets, e.g. static and/or dynamic libraries + the application executable.

However, the new target-based qt_add_{lupdate,lrelease,translations} CMake helpers which are recommended in favour of the now deprecated qt_add_translation and qt_create_translation, only supports specifying a single target. This forces you to give up on the convenience of automatic source file deduction and having to specify all sources manually.

It would be good if there was a better way to handle this use case. Possibly the helpers could take multiple targets as arguments?