Add Copy On Drop for the page module (via CTRL Key)
Currently the core can only drag & drop content in order to move elements from A to B.
On the other hand the page tree offers the option to copy a page by pressing the CTRL-Key while dropping it.
This feature should be implemented for tt_content as well, so that elements will be copied in place on drop.
To avoid having to generate new content elements via JS or to fetch them via AJAX the page will be reloading after creating such a copy.
Due to CMS 8 being based on PHP 7 the time to reload the page is just a few milliseconds, which is affordable.