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)