Present C++ timing features

[sponce]

Mainly the chrono library, including clocks, time_point and duration so that people can easily do dedicated timing of a few lines of code, basically though code like :

#include <chrono>

// other clocktypes to high_resolution_clock are steady_clock or system_clock
// see https://www.modernescpp.com/index.php/the-three-clocks for details
std::chrono::high_resolution_clock clock;

clock::time_point startTime = clock::now();
... // code to be timed
std::chrono::duration<float> ticks = clock::now() - startTime;
auto millis = std::chrono::duration_cast<std::chrono::milliseconds>(duration);
std::cout << "it took " << duration.count() << " ticks, that is " << millis.count() << " ms\n";

[bernhardmgruber]

std::chrono::high_resolution_clock clock;

Wow, I have never seen anyone create an instance of a clock :D I did not know that works!

[bernhardmgruber]

I changed the milestone to the summer course, because it's an advanced topic.

[hageboeck]

This was completed in #524