Add support for diffraction calculations using the UDFA

With this MR an additional diffraction implementation is implemented for itaGeoPropagation based on the UDFA by Kirsch and Ewert¹. Note, that in order to use this, the UDFA toolbox must be installed.

1. C. Kirsch and S. D. Ewert, "A Universal Filter Approximation of Edge Diffraction for Geometrical Acoustics," in IEEE/ACM Transactions on Audio, Speech, and Language Processing, vol. 31, pp. 1636-1651, 2023, doi: 10.1109/TASLP.2023.3264737.

applications/SoundFieldSimulation/Pigeon/@itaGeoPropagation/tf_diffraction.m

@@ -66,6 +66,9 @@ switch( diffraction_model )
         % With or without spreading loss after diffraction
         linear_freq_data = obj.tf_diffraction_utd( w, effective_source_position, effective_receiver_position );
         
+    case 'udfa'
+        linear_freq_data = obj.tf_diffraction_udfa( effective_source_position, effective_receiver_position, anchor );
+
     case 'maekawa'
         
         linear_freq_data = obj.tf_diffraction_maekawa( w, effective_source_position, effective_receiver_position );