Serve over DLNA

[bvanhee]

Pre-Submission checklist

• There is no existing issue that already asks for this feature.
  
• The feature already exists in rclone (on your PC or in Termux)
• I am prepared to help make this feature

What version of Round Sync are you using (About -> App version)?

2.5.6

What problem are you trying to solve?

I would like to access a S3 remote over DLNA from a VLC client running on Android TV.

What should Round Sync be able to do differently to help with this problem?

Round Sync should offer the DLNA protocol when serving a remote content. It should also offer the choice to listen on all IPs and not only on localhost/127.0.0.1 as it is actually the case wih the HTTP and WebDAV options.