TODO

• Push there, pull here
• Implement server connection
• Implement message building and put the following hint at the beginning of this file: To build this, the master branch of vt6.rs needs to be checked out in a sibling directory of this repo.
• Implement vt6 negotiation
• Be able to run executables in pipeline (is that already possible, only that all remaining input goes into the pipe?)
• When is output being flushed? And by whom? By the terminal? In other words, is it the terminals fault that yes does not print y's?