Changed GameSequenceRep from struct to class

Author: StephenPasteris

src/games/behavspt.h

@@ -30,7 +30,7 @@
 namespace Gambit {
 
 class GameSequenceForm;
-struct GameSequenceRep;
+class GameSequenceRep;
 class SequencesWrapper;
 class PlayerSequencesWrapper;
 class InfosetsWrapper;

src/games/gameseq.h

@@ -28,7 +28,7 @@
 
 namespace Gambit {
 
-struct GameSequenceRep {
+class GameSequenceRep {
 public:
   GamePlayer player;
   GameAction action;