Render data as plots

[TheLortex]

It's possible to have nice graphs in the terminal using unicode braille characters. https://github.com/asciimoo/drawille

Could be useful for:

• histograms (GC latency / taks poll time)
• evolution of memory usage
• runtime events intensity (n° of events per second)
• scheduler intensity (n° of context switches per second)
• user-provided data using well-known runtime event types (could be the included counter)