[Feature request] support URI schemes

[drwetter]

Which version are you referring to

3.3dev

Describe your feature request (if it's a technical feature)

Schemes like smtps:// , ftps://, imaps://, pop3s://, etc. . which are more or less standardized .

In addition we could use sdns:// for DoH or quic:// for QUIC.

We need to think about whether e.g. when we require a port and when not. smtp e.g. is quite ambiguous . Also, whether schemes like smtp:// (w/o trailing s) signals plaintext ports with STARTTLS.