add showCards function to receive cards from players which hit the show-cards-button during postriver. define static ranking game data

src/gui/qt/guiwrapper.h

@@ -85,6 +85,7 @@ public:
 
     void postRiverAnimation1();
     void postRiverRunAnimation1();
+    void postRiverShowCards(unsigned playerId);
 
     void flipHolecardsAllIn();