Open Ports screen enhancement: launch clients for SSH, RDP, VNC, similar to existing HTTP/HTTPS support

[jrwarwick]

The client launch feature for open HTTP/HTTPs ports is really slick. It would be even better to also have similar functionality for open SSH ports (22), RDP (3389), and VNC (5900), in that order. Maybe even ports 445 (for SMB file browsing/tranfser) and 20/21 (for old FTP).

All of these protocols definitely have a selection of clients available on Android, though I don't know much about how/when a client is "registered" as a protocol handler with the OS.