Add warning that std::chrono::system_clock is not supported on hardware even though it may work fine in the sim

[kestara]

(This confusion has happened at least two times link 1 link 2)

Idea: If use of std::chrono::system_clock is detected (unsure how) then add a warning in the console that on the watch this will result in undefined behaviour.

[NeroBurner]

I very much like the idea, but sadly I don't know how to pull it off.