Feature request: Add support for FTPS to FTP plugin

[edasaki]

Many shared hosts don't support SFTP or unencrypted FTP.

It would be super useful if there could be an extra option added to force the FTP plugin to use SSL/TLS.

Right now, attempting to upload using FTP on a server that requires encryption yields this error:

ftplib.error_temp: 421 Sorry, cleartext sessions are not accepted on this server.

As an example, FileZilla has an Encryption option with the FTP protocol that allows you to choose between "Only use plain FTP (insecure)", "Require implicit FTP over TLS", "Require explicit FTP over TLS", and "Use explicit FTP over TLS if available". The latter options allow proper connection and uploading to a server that only allows FTPS.

[ClocxHD]

Don't know if you still need it, but recently i switched to Linux + ScreenCloud and had the same issue, so i wrote a plugin myself:
https://github.com/ClocxHD/screencloud-plugin-ftps

Feel free to hit me up if you have any questions!