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Frank Winklmeier authored May 13, 2019 and Marco Clemencic committed May 13, 2019

Implement a `Gaudi::Timer` class that accumulates its statistics in a
`Counter`:
- `GenericTimer` is a generic timer that can be templated with a
  `std::chrono`-compatible clock and a precision. A timing measurement
  is done via the RAII helper class `ScopeTimer`.
- The Timer can register itself with an owner using the dedicated
  constructor.
- `RdtscClock` is a (non-walltime) clock based on `rdtsc`. Depending on
  the available CPU this can be significantly faster than the default
  clock. Run the `test_GaudiTimer` unit tests for a measurement of the
  overhead of the various clocks.
- `Gaudi/Timers.h` provides a default `Gaudi::Timer` based on wall-clock and
  `Gaudi::FastTimer` based on the `RdtscClock`.

- Add new `Gaudi/Chrono/Counters.h` header file that is supposed to be
  included when duration-base Counters are needed.
- Allow specialization of `sqrt` within the `Gaudi::Accumulators`
  namespace for custom types via ADL.
- Only define `std::chrono::duration` stream operator for <=C++17.

Add helpers to stream and calculate with std::chrono::duration objects.
This makes them directly usable with Gaudi::Accumulators. Add unit test
case.

Gitlab CI authored Feb 01, 2019 and Marco Clemencic committed Feb 01, 2019

patch generated by standalone job

* introduce CounterHolder, which keeps track of the
  available counters, and provides declareCounter,
  findCounter, forEachCounter, nCounters and clearCounters

- moved related headers to different hierarchy
  - Gaudi/Parsers/XYZ.h