* Primary functionality implemented for CIFS
This will add CIFS support to Duplicati.
One of the advantages is that the resource does not need to be mounted as the backend connects and authenticates directly to the resource via TCP/or Netbios over TCP.
The authentication supported is domain/username/password. At present integrated Windows authentication is not supported.
This implementation relies on SMBLibrary library (https://github.com/TalAloni/SMBLibrary).
* Fixes to XML documentation
* Implementing single CIFS connection + Fix on PutAsync
Single CIFS connection to avoid re-authentication on every operation.
Fix to PutAsync which only because apparent after file sizes were larger than _smb2Client.MaxWriteSize
* Adding CI tests for CIFS
The CI test for CIFS is self contained, requiring no environment variables. Also updated README.
* 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.
