Jeck - [JGE recompile needed] Shop cleanup, Interface enhancements.

Added basic transition system that works with GameApp's phases. Currently does a fade-out between elements, which works well in some places and not-so-well in others. We'll definitely want to think about where and where not to use it... they'd work a lot better if we could spawn a thread to handle loading the next state while transitioning.

Also cleaned up the shop a bit, so it uses ReadButton() instead of GetButtonClick()-- hence the slight change to JGE. Added a tiled image for the task board, which loads conservatively (I tried 128x128, but it didn't look as good).

projects/mtg/include/GameStateTransitions.h

@@ -0,0 +1,33 @@
+#ifndef _GAME_STATE_TRANSITIONS_H_
+#define _GAME_STATE_TRANSITIONS_H_
+
+#include <JGE.h>
+#include <JGui.h>
+#include "../include/GameState.h"
+
+class TransitionBase: public GameState, public JGuiListener{
+public:
+  TransitionBase(GameApp* parent, GameState* _from, GameState* _to, float duration);
+  virtual void Start();
+  virtual void End();
+
+  virtual bool Finished() {return (mElapsed >= mDuration);};
+  virtual void Update(float dt);
+  virtual void Render() = 0;
+  virtual void ButtonPressed(int controllerId, int controlId);
+
+  float mElapsed;
+  float mDuration;
+  GameState* from;
+  GameState* to;
+  bool bAnimationOnly; //Does not call start or end on subordinates.
+};
+
+class TransitionFade: public TransitionBase {
+public:
+  TransitionFade(GameApp* p, GameState* f, GameState* t, float dur, bool reversed);
+  virtual void Render();
+  bool mReversed;
+};
+
+#endif