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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`.

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

The new counters have a few new features compared to existing StatEntity :
  - they are templated by the counted type
  - they come with different flavors counting only what you need (e.g. simple count, no stat)
  - more flavour can easily be created at will thanks to the AccumulatorSet object
  - they come with 2 implementations : thread safe or not
  - the thread safe ones use atomics and should be as efficient as possible
  - a Buffer object allows to easily buffer updates to a counter made in a tight loop, without paying the atomic price each time

A Small unit test is available in the test suite and example code is provided in the comments of Counters.h where they are implemented.
Existing code has been adapted, in particulat the ChronoSvc.

- remove destructors qualified with 'override = default'
- prefer inheriting constructors

... plus some formatting tweaks,

Improved the way the new PluginService is used, deprecating the
old XYZFactory.h files and introducing a backward compatibility
hack to allow the old-style non-public constructor.

 - Fixed icc remark #424: extra ";" ignored


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@6090 53ecefc3-a64d-0410-9bdf-b8581fa3287e

See https://twiki.cern.ch/twiki/bin/view/Gaudi/GaudiSVNRepository


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@6014 53ecefc3-a64d-0410-9bdf-b8581fa3287e