ftp/wush: New port: CLI P2P file transfer tool

wush is a command line tool that lets you easily transfer files and
open shells over a peer-to-peer wireguard connection. It's similar to
magic-wormhole but:

• No requirement to set up or trust a relay server for authentication.
• Powered by Wireguard for secure, fast, and reliable connections.
• Automatic peer-to-peer connections over UDP.
• Endless possibilities; rsync, ssh, etc.