Upload folders

Currently people have to manually create folders inside folders and then upload files to them.

Make a feature which allows brs to upload a single zip folder to the website and the website will automatically create the file and folder objects and upload the files to onedrive.

However there is a major issue with this, currently a folder can only have either folders as its children or files as its children, so I have two ideas to solve this:
1. if a folder has both folders and files as its children then put the files in a seperate folder with some name (like the parent folder name itself). if a folder only has folders or files then its simple.
2. (check issue #171 ) if a folder can have both files and folders as its children, then doing this feature would be much easier ( I think)

Beginne damit, Issue #171 zu lesen und den bestehenden Website-Upload-Ablauf nachzuverfolgen, einschließlich der Erstellung von Ordner- und Dateiobjekten und der Art und Weise, wie Dateien an OneDrive gesendet werden. Kläre, ob gemischte Datei- und Ordnerkinder unterstützt werden, oder definiere das Verhalten für separate Ordner. Als abgeschlossen gilt, dass ein einzelner ZIP-Upload seine Ordner wiederherstellt, seine Dateien hochlädt und beide Ordnerstrukturen konsistent verarbeitet.

Vom Indexierungsmodell aus dem Issue-Text verfasst.