[Game] Add shortcuts for same size and hand size - 1 mulligans (#6483)

Took 21 minutes

Took 3 seconds

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/game/player/player_actions.h

@@ -85,6 +85,9 @@ public slots:
     void actDrawCards();
     void actUndoDraw();
     void actMulligan();
+    void actMulliganSameSize();
+    void actMulliganMinusOne();
+    void doMulligan(int number);
 
     void actPlay();
     void actPlayFacedown();