Add detector checksum facility

[MarkusFrankATcernch]

BEGINRELEASENOTES

• Add detector checksum facility as plugin: Compare different detector setups
• Gives identical hash results for TGeo units and G4 units
• Supports detector dumps with "unified" strings for debugging

Usage: -plugin DD4hepDetectorChecksum -arg [-arg]                             

     -detector <string>     Top level DetElement path. Default: '/world'        
     -readout               also hash the detector's readout properties         
                            (sensitive det, id desc, segmentation)              
                            default: false                                      
                                                                                
   Debugging: Dump individual hash codes (debug>=1)                             
   Debugging: and the hashed string (debug>2)                                   
     -dump_elements         Dump hashes of used elements                        
     -dump_materials        Dump hashes of used materials                       
     -dump_solids           Dump hashes of used solids                          
     -dump_volumes          Dump hashes of used volumes                         
     -dump_placements       Dump hashes of used placements                      
     -dump_detelements      Dump hashes of used detelements                     
     -dump_sensitive        Dump hashes of sensitive detectors                  
     -dump_readout          Dump hashes of readout entities                     
     -dump_iddescriptors    Dump hashes of ID descriptors                       
     -dump_segmentations    Dump hashes of readout segmentations                
                                                                                
   Modify units in the created hash strings (deprecated):                       
     -length_unit  <value>  Unit of length  as literal. default: mm             
     -angle_unit   <value>  Unit of angle   as literal. default: deg            
     -energy_unit  <value>  Unit of energy  as literal. default: GeV            
     -density_unit <value>  Unit of density as literal. default: g/cm3          
     -atomic_unit <value>   Unit of atomic weight as literal. default: g/mole   
                                                                                
     -debug <number>        Enable debug printouts.                             
     -help                  Print this help output

ENDRELEASENOTES