See merge request !705

See merge request !688

See merge request !701

see !604

Add support for EventContext as input to Gaudi::Functional algorithms

See merge request !671

See merge request !696

See merge request !695

Fixes LHCBPS-1792

it avoids spurious test failures on busy Gitlab-CI runners

CMake 3.11 looks for ninja in CMAKE_PREFIX_PATH and the SFT builds of it
requires libstdc++ more recent than the system version.

Gitlab CI authored 6 years ago and Andrea Valassi committed 6 years ago

patch generated by https://gitlab.cern.ch/valassi/Gaudi/-/jobs/1471225

- prefer CommonMessaging when available
- add generic visit to downcast INTupleItem to concrete type and
  invoke the provided callable, and use that to dispatch lambdas
  instead of explicit switch statements with almost identical function
  calls
- use boost::string_ref to avoid copying strings more than strictly
  required
- prefer direct member initialization

- prefer boost::string_ref instead of const std::string& in interfaces
- add transparant comparison when using std::map, so that a string_ref
  can be used to search in a map which has keys of type std::string
- move standalone functions only visible in a single compilation unit
  into an anonymous namespace so that these functions are not visible
  to the linker