move/copy file - add "create folder" capability #11727

Steps to reproduce and actual behaviour

1. From some user's home directory (i.e. "AutoUploads/Camera"), select some photos to be filed/organized.
   

2. Choose "Actions...", "Move or copy"
   

3. Browse/traverse into the target destination (in my case this is an external SMB mount for which I do have write access to)
   

4. When user arrives into destination, there is no way to create a new sub-directory during this activity. Which means they have to go BACK (or open new tab), browse into that target, create directory, then go back to move/copy dialogue, refresh, then choose that one :(

Expected behaviour

Here's my proposal:

Server configuration

Operating system: Linux host/server (Ubuntu 18.04) and Linux client (Firefox)
Web server: apache2 2.4.18-2ubuntu3.9
Database: mysql-common 5.7.23-0ubuntu0.16.04.1
PHP version: php7.0-common 7.0.32-0ubuntu0.16.04.1
Nextcloud version: 14.0.0
Updated from an older Nextcloud/ownCloud or fresh install: nope (greenfield)
Are you using external storage, if yes which one: SMB/CIFS
Are you using encryption: no
Are you using an external user-backend, if yes which one: not atm

Client configuration

Browser: Firefox
Operating system: Linux