Commits on Jan 10, 2022

1. Allow downloads from widgets …

   Notes: Allow downloads from widgets.
   
   We are working on a widget that allows the user to download a file (a ICS calendar entry). Right now the sandbox of the widget iframe doesn't allow downloading. Instead, the following error is displayed in the console (for Google Chrome):
   
   ```
   Download is disallowed. The frame initiating or instantiating the download is sandboxed, but the flag ‘allow-downloads’ is not set. See https://www.chromestatus.com/feature/5706745674465280 for more details.
   ```
   
   Therefore this PR adds `allow-downloads` to the sandbox capabilities.
   
   Steps to reproduce:
   1. Create a simple widget with an `index.html` file like, e.g.
      ```
        <a href="index.html" download>Download</a>
      ```
   2. Host the widget somewhere, add it to the room and open the widget
   3. Click on the download button
     * Without the fix: Nothing happens, there is a warning in the console (see above)
     * With the fix: The file is downloaded
   
   Signed-off-by: Oliver Sand <oliver.sand@nordeck.net>

   

   Fox32 committed Jan 10, 2022
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