Use class WriteIncludesBase and store classes encountered in a
per-module hash (Qt/custom widgets). Write out only the required
classes.
Add --star-import as a fallback should the change cause issues.
Task-number: PYSIDE-1404
Change-Id: Ic50e26758ddd0f2f8aebbce470d32a36fb09a2c4
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>