build 200728. basic train passenger information system, event condition diagnostics enhancement, ai door control logic fix

mtable.h

@@ -12,6 +12,7 @@ http://mozilla.org/MPL/2.0/.
 #include <string>
 
 #include "Classes.h"
+#include "sound.h"
 
 namespace Mtable
 {
@@ -38,6 +39,7 @@ struct TMTableLine
     float tm{ 0.f }; // czas jazdy do tej stacji w min. (z kolumny)
     bool is_maintenance{ false };
     int radio_channel{ -1 };
+    sound_source name_sound{ sound_placement::internal };
 };
 
 typedef TMTableLine TMTable[MaxTTableSize + 1];
@@ -65,7 +67,10 @@ class TTrainParameters
     std::string ShowRelation() const;
     double WatchMTable(double DistCounter);
     std::string NextStop() const;
+    sound_source next_stop_sound() const;
+    sound_source last_stop_sound() const;
     bool IsStop() const;
+    bool IsLastStop() const;
     bool IsMaintenance() const;
     bool IsTimeToGo(double hh, double mm);
     bool UpdateMTable(double hh, double mm, std::string const &NewName);
@@ -80,6 +85,10 @@ class TTrainParameters
     void serialize( dictionary_source *Output ) const;
     // returns: radio channel associated with current station, or -1
     int radio_channel() const;
+    // returns: sound file associated with current station, or -1
+    sound_source current_stop_sound() const;
+private:
+    void load_sounds();
 };
 
 class TMTableTime