Merge topic 'AUTOMOC-cxxmodules-support'

6280cc3df9 Autogen: Add AUTOMOC support for C++ module units
266c6f0109 Autogen: Factor out the info-file source-entry reader

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Vito Gamberini <vito.gamberini@kitware.com>
Reviewed-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !12490