* Change displayname of OneDrive v2
Since OneDrive v1 is removed, there is no need to name the current backend `v2`.
* Renamed everything but the protocol key
For this change, what was known as the alternate FTP client which uses FluentFTP library now officially replaces the FTP Backend which still used the deprecated FtpWebrequest.
To mantain compatibility with existing configurations, both ftp and aftp targets and configuration prefixes are accepted.
