C++ named requirements: TrivialClock (since C++11)

The TrivialClock requirements describe the requirements satisfied by several clocks in the chrono library.

For a type TC:

The type must meet Clock requirements.
The types TC::rep, TC::duration, and TC::time_point satisfy the requirements of EqualityComparable, LessThanComparable, DefaultConstructible, CopyConstructible, CopyAssignable, Destructible(until C++17), Swappable, and NumericType.
The function TC::now() does not throw exceptions.
The type TC::time_point::clock meets the TrivialClock requirements, recursively.

The following types in the standard library satisfy TrivialClock requirements:

system_clock (C++11)	wall clock time from the system-wide realtime clock (class)
steady_clock (C++11)	monotonic clock that will never be adjusted (class)
high_resolution_clock (C++11)	the clock with the shortest tick period available (class)
file_clock (C++20)	Clock used for file time (typedef)
file_time_type (C++17)	represents file time values (typedef)

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