Adds console.sparkline to all web pages and Chrome Devtools
Similar to console.log(),
console.sparkline() lets you mix strings and other arguments,
and any Array of numbers you pass becomes a pretty sparkline:
If you have some page code that already happens to spit out arrays of
numbers via one of the console logger functions (and doesn't bind them
at load time), you can assign console.log = console.sparkline and
get them to show up for free as above; it is api compatible (besides
taking over the %c handling that I think mostly nobody uses anyway).