Improve accessibility

[milosen]

• make ARC usable for non-python users
• reviewers have suggested GUI
• edit: build simple command line interface with click + "cheat sheet"
• TODOs:
  • command generate
  • command evaluate-lexicon
  • command evaluate-stream
  • provide all options
  • create "cheat sheet" pdf

[milosen]

After some consideration, a GUI seems to have several drawbacks in our case. Most importantly, arc has pretty minimal dependencies and is a relatively simple application that should run on anyone's laptop. Adding a GUI would make the dependencies much more complicated, especially regarding platform support. Further, they tend to look rather unpolished if not maintained by a team with a graphic designer. There is not much to display anyway, accept maybe a window with logs and the output.

[milosen]

We instead opt for a simple command line interface with an extended help page and a pdf "cheat sheet".