Favor LHCbalgs version so that Gaudi::algorithm is the base class and not GaudiAlgorithm

Also added namespaces here and there when more practical

see Boole#10

Files dropped at this stage :
    Kernel/LHCbKernel/include/Kernel/CaloCellID.h
    Kernel/LHCbKernel/include/Kernel/FTChannelID.h
    Kernel/LHCbKernel/include/Kernel/MuonTileID.h
    Kernel/LHCbKernel/include/Kernel/UTChannelID.h
    Kernel/LHCbKernel/include/Kernel/VPChannelID.h
    Kernel/LHCbKernel/src/VPChannelID.cpp

The rest of the code has been adapted to use native namespace from the Detector package

Mainly cleanups allowing to compile both with a DetDesc and a DD4hep backend
Note that this included removing Prs and Spd code as these are not implemented in DD4hep

closes #154

- and thus, impliclicitly, to Gaudi::Algorithm
- also, migrate away from UTAlgBase:
   - specify DeUTDetector as dependency
   - use ToolHandle for readout tool
- prefer standalone functions in anonymous namespaces over member functions

* GenCountersFSR does not contain any member data (only a `static`
  mapping of enum to string), so make it non-instantiable, and remove
  inheritance from DataObject
* GenFSR:
    - remove expensive conversion of enum to string, followed by
      string comparisons (error prone, as the compiler cannot check for
      misspeliing, but can check for invalid enum values) and conversion
      back to enum
    - allow lookup by `string_view` to avoid having to create
      `std::string` when a literal string is passed
    - prefer STL algorithms and range-based loops

The intention being to measure the impact (if any) on throughput with a
modern compiler

also update version to 53.0

Note that this is depending on Gaudi!1199 where MergingTrasformer is
given the possibility to return void

Note that this is depending on Gaudi!1199 where MergingTrasformer is
given the possibility to return void

This makes the code compatible with Python 3

* use actual base class name, i.e. `extends` instead of `base_class` typedef
* prefer ToolHandle
* prefer MsgCounter
* prefer void return type for function whose StatusCode returnvalues are always ignored

* prefer ToolHandle
* prefer MsgCounter<MSG::WARNING> over Warning
* prefer monadic StatusCode functionality

Add pgprimaryvertex check script

See merge request !2516

(cherry picked from commit eb89bf23)

73cc313c add script for use in tests to see if output of step contains the pg primary vertex
d45707c7 Fixed formatting
0e3a4aaf add copyright
93794800 default to logging instead of print
ed2a195f Fixed formatting
02d55183 replace logging with log
9b24fcd2 Fixed formatting

* use Gaudi::Functional
* use Gaudi::Accumulators
* use DataObjectHandle
* amalgamate headers into implementation files
* use monadic StatusCode functionality