DevelopmentTagger enum and string conversion

@vchobano @mfuehrin @wendelj Adds enum for the old DevelopmentTagger that is reenabled for future FT WG Run2 Tuple Production.

Note: TaggerTypeToString and TaggerTypeToType are only called in BTaggingTool.cpp in Phys in few places, therefore impact is small.

Modernization was needed because previous static map implementation behaved strangely with lb-checkout LHCb/branch_with_changes Event: Newly implemented tagger types in the string-type mapping were unavailable in Phys/FlavourTagging and only the old ones were found. At the same time, all other methods implemented in Tagger.h behaved as expected. This implementation ties the static map to the Tagger class, which seems to solve this issue.

Event/PhysEvent/include/Event/Tagger.h

@@ -97,20 +97,9 @@ namespace LHCb {
       DevelopmentTaggerDev = 40199,
     };
 
-    /// Copy Constructor
-    Tagger( const Tagger& c )
-        : m_type( c.type() )
-        , m_decision( c.decision() )
-        , m_omega( c.omega() )
-        , m_mvaValue( c.mvaValue() )
-        , m_charge( c.charge() )
-        , m_taggerParts( c.taggerParts() ) {}
-
-    /// Default Constructor
-    Tagger() : m_type( 0 ), m_decision( 0 ), m_omega( 0.50 ), m_mvaValue( 0.0 ), m_charge( 0.0 ) {}
-
-    /// Default Destructor
-    ~Tagger() {}
+    Tagger() = default;
+    Tagger( const Tagger& c ) = default;
+    ~Tagger() = default;
 
     /// Fill the ASCII output stream
     std::ostream& fillStream( std::ostream& s ) const;
@@ -123,7+112,7 @@
 
     /// Retrieve const  The type of tagger
     unsigned short int type() const;
 
     /// Update  The type of tagger
     void setType( unsigned short int value );
 
@@ -176,7+165,7 @@
 
   protected:
   private:
-    unsigned short int             m_type;        ///< The type of tagger
-    short int                      m_decision;    ///< decision of tagger
-    float                          m_omega;       ///< wrong tag fraction of tagger from MC tuning
-    float                          m_mvaValue;    ///< raw output of the mva
-    float                          m_charge;      ///< (weighted) charge of the tagging particle
+    unsigned short int             m_type = TaggerType::none; ///< The type of tagger
+    short int                      m_decision = 0;            ///< decision of tagger
+    float                          m_omega = 0.5;             ///< wrong tag fraction of tagger from MC tuning
+    float                          m_mvaValue = 0;            ///< raw output of the mva
+    float                          m_charge = 0;              ///< (weighted) charge of the tagging particle
     SmartRefVector<LHCb::Particle> m_taggerParts; ///< Vector of Particle(s) used to build the Tagger
 
   }; // class Tagger