See merge request gaudi/Gaudi!1444

See merge request !1479

See merge request !1481

See merge request !1227

See merge request !1478

See merge request !1473

See merge request !1471

See merge request !1480

- move Gaudi::Funtional to GaudiFunctional subdir
  - headers are now under "Gaudi/Functional"
  - legacy GaudiAlg corresponding header redirect to the new ones
- replace GaudiAlgorithm with Algorithm wherever possible in tests and
  utilities
- add Gaudi::Sequencer basic implementation to replace GaudiSequencer
- move GaudiAlg specific tests, examples, dictionaries and Python modules
  to GaudiAlg subdir
- add CMake option GAUDI_ENABLE_GAUDIALG to allow skipping GaudiAlg
  (default to true)
- minor fixes and clean ups

See merge request !1472

See merge request !1475

See merge request !1476

only showing on el9 gcc12

- change default LCG to 103
- run build and test in one job
- test centos7 and el9
- use LCG 102b x86_64-centos7-gcc11-opt as minimum version

See merge request !1474

adding a test to make sure we compile an instantiation of it

See merge request !1469

Closes #262

See merge request !1467

See merge request !1466

See merge request !1465

See merge request !1464

See merge request !1461