Extended Scroll() and OnScroll() to also take in magnitude as one of its parameters. magnitude is currently used in the deck editor to figure out how many cards to rotate around per swipe as function of velocity and the number of cards displayed on the screen.

fixed a compiler warning in SimplePopup in the constructor declaration
===DECK Editor changes ===
Added two touch buttons , one for "Sell Card", the other to switch between Deck and Collection.
changed swipe Left/Right to rotate card collection; removing the previous action which was to swap between deck/collection viewing

Note: GameStateDeckViewer isn't a JGuiController so can't leverage off the mButtons vector.  Thus, the buttons have to be handled by this class separately. (setButtonState, userPressedButton)

projects/mtg/include/GameStateShop.h

@@ -115,7 +115,7 @@ public:
     virtual void Update(float dt);
     virtual void Render();
     virtual void ButtonPressed(int controllerId, int controlId);
-    virtual void OnScroll(int inXVelocity, int inYVelocity);
+    virtual void OnScroll(int inXVelocity, int inYVelocity, int magnitude = 0);
     static float _x1[], _y1[], _x2[], _y2[], _x3[], _y3[], _x4[], _y4[];
 };