Change Cupcake result, fix unicorn to be truly rare

• The unicorn ascii art shown on zero warns/fails was added because this was rare. But the fun gamification reward of no FAILs should be common! 😃 And it will be, once #1939 #1940 and #1941 are fixed. So lets add a small cupcake ascii art to terminal output when no FAILs occur.
• If you use the -c arg to only run one check, you’ll commonly see all checks pass and get a unicorn, unfairly 😉

As a reference, this is our current unicorn ascii-art:

[felipesanches]

I commissioned this artwork from a friend, a brazilian type designer called Tony de Marco:

[felipesanches]

To make clear what’s my criticism of Chris’ cupcake:

• It is too big if compared to the space available in a single screen on the terminal (without needing to scroll). The previous artwork did fit nicely in the available space. But I had to tweak the font size in my virtual terminal in order to take the screenshot above with the proposed cupcake.
• It is filled with characters and dithering effects, which clearly indicates it was likely automatically generated by passing an image into a special purpose ascii-art filter. The original unicorn artwork on the other hand was carefully designed by an ascii-artist, carefully choosing which characters would best convey the artwork outlines. I’d like to keep that style as our users are all type designers who value such extreme attention to details.
• The cherry on top is disturbingly small LOL

So, let’s wait until I get some response from my friend and I’ll let you all know what we’ve got. I’ve used these insights that were gathered by observing @chrissimpkins proposal while preparing a brief of what I’d like to see. So I consider that Chis’ proposal is indeed useful and welcome 😃 Thanks!