Unify make dir and duplicate dialogs

[KoBeWi]

When duplicating a file/folder, there is this bare-bones dialog with just name input. I wanted to enhance it a bit, but noticed that DirectoryCreateDialog is very similar, so I just unified them.

• DirectoryCreateDialog (name pending) now supports file and directory mode and
• the dialog now takes a callback, which is called after accepting. It sends the validated path as argument
• creating new directory was adapted to the new dialog
• when you duplicate file, the new DirectoryCreateDialog will be used for validation (instead of validating after accepting 🤦‍♂️)
• you can now duplicate the file into another directory, which will be created if it doesn't exist

9SwvcD37u5.mp4

This will also allow to unhack #79966

Note that the PR is ready for review, but I still need to rename DirectoryCreateDialog into something that makes more sense with the new functionality.

[YuriSizov]

I can propose something like EditorCopyMoveDialog, referring to the cp and mv commands which are closely related to the functionality here. It doesn't cover the create portion, but it doesn't sound too terrible IMO. And helps to distinguish it from the big, full-featured file dialog.

[akien-mga]

Thanks!