Implement reorganisation of categories

• Extend LauTimeDepFitModel::CPEigenValue enum to add state QFS = 0
• Use this to decide whether the sinh and sin terms (Re/Im of q/p A* Abar) should be 0 (QFS), normal (CPEven) or multiplied by -1 (CPOdd)
  • Similarly for the corresponding terms in the normalisation
• Remove all the SimFit... states from LauDecayTimePdf::FuncType enum
• Use ExpTrig vs ExpHypTrig to control whether DeltaGamma should be treated as identically zero or not
  • Can consider renaming these states if we think it isn't clear what they mean at the moment (although they are anyway Doxygen documented)
• The other states in that enum are for backgrounds really, so will leave those as they are for the moment and we can revisit in due course