Add rsync backend

[Heidistein]

Feature request
It would be a 'nice to have' if an rsync URL could be entered in, so that versioning info could be pulled from there.
Low priority for me.

[Zlopez]

Just to be sure, what do you mean by rsync URL?

[Heidistein]

I think you are checking if I dont mean rsync-over-ssh, which I dont. I mean just rsync services, as in this (bad) example:

$ rsync  rsync://rsync.php.net:/phpweb/releases/
drwxr-xr-x         12,288 2019/03/20 20:50:03 .
-rw-r--r--          6,354 2018/10/17 10:30:04 4_1_0.php
-rw-r--r--          8,240 2018/10/17 10:30:04 4_1_0_fr.php
...

[Zlopez]

Ok, this shouldn't be a problem to add.