Concat Parent Page Slugs

The ‘Concat Parent Page Slugs’ add template file loading rule for ‘Pages’.
When loading the template of the child page, preferentially loading the template file that concatenated parent page slugs.
For example, create a page with slug ‘foo’, ‘bar’.
‘foo’ is the parent, ‘bar’ is the child.
Normally the template file for slug ‘bar’ will be ‘page-bar.php’, using this plugin adds parent slugs to child slug, like ‘page-foo.bar.php’.
Of course it is also possible to change the delimiter to ‘page-foo_bar.php’.

Sample.
[slug] : [template]
company : page-company.php
|- info : page-company.info.php
|- access : page-company.access.php
|- map : page-com…