Support FTP over SSL about coreftp

[kwilliamssbs]

So far, yours is the only .NET Core FTP library we've found that can replace our old FTP library, so if you need or want any help on this one (it's the last requirement for us), then let me know!

[sparkeh9]

I'm working on it as we speak :D, I have the control connection encrypted using TLS (implicit and explicit), just need to get the data connection doing the same and it should be good to go.

[kwilliamssbs]

Good stuff! We can put that in production once that's ready. If you need any help in the future, let us know - our FTP component has been the one thing stopping our solution going full-NETCore for ages!

[sparkeh9]

👍 That is why I started writing this library, I noticed Microsoft had removed all the built in stuff for it, and nothing was targeting anything other than the desktop framework

[sparkeh9]

UPDATE: I have TLS somewhat working for the control and data connections. However, I'm having a strange issue where the welcome message is delayed, the code assumes no 220 code is coming and so skips it. The AUTH TLS is then sent, but then receives the 220 from the initial connection, from the data stream.