Add waypipe as a display option

[balsoft]

• [x] I tested it locally.
• [x] I tried to run at least one application VM and it works.

resolves #15

BTC{1AYoK2TScSpD5bhf67mv9AxHDJ2RidRvjD} (I promised this guy $10 and didn't pay in time, hope $50 covers it)

Please review with care, I don't know Go.

Also, this breaks backwards compatibility with older nix expressions for programs, hope this is fine as we've not released appvm yet.