Move pages#44

It would be helpful, if the panel allowed to move pages to another parent. This would need:

• a “move” option in the settings dropdown
• a file browser similar to the pages field with template verification:
  • either only showing pages in the browser that allow the current template as child
  • or offering a way to switch templates on move (highlighting the fact that content might be lost)

Discussion: https://github.com/getkirby/ideas/issues/134

Can be used also for Duplication

For now you can try this plugin:
https://getkirby.com/plugins/owebstudio/move-pages

that should be included in the core