Added Entityx logic (Movement|Render|Destruct)

src/input/InputHandler.h

@@ -19,7 +19,9 @@ private:
 public:
     InputHandler();
     ~InputHandler();
+    //Called when an KeyDown or KeyUP event happened
     void inputEvent(SDL_Event *e);
+    //Called by the main GameLoop to get the newest Command
     Command* handleInput();
 };