Add PhysicsEffects to Extras. The build is only tested on Windows and Android.

The Android/NEON optimized version of Physics Effects is thanks to Graham Rhodes and Anthony Hamilton, See Issue 587

Extras/PhysicsEffects/sample/api_physics_effects/common/ctrl_func.h

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+/*
+Physics Effects Copyright(C) 2010 Sony Computer Entertainment Inc.
+All rights reserved.
+
+Physics Effects is open software; you can redistribute it and/or
+modify it under the terms of the BSD License.
+
+Physics Effects is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+See the BSD License for more details.
+
+A copy of the BSD License is distributed with
+Physics Effects under the filename: physics_effects_license.txt
+*/
+
+#ifndef __CTRL_FUNC_H__
+#define __CTRL_FUNC_H__
+
+enum ButtonID {
+	BTN_SCENE_RESET=0,
+	BTN_SCENE_NEXT,
+	BTN_SIMULATION,
+	BTN_STEP,
+	BTN_UP,
+	BTN_DOWN,
+	BTN_LEFT,
+	BTN_RIGHT,
+	BTN_ZOOM_IN,
+	BTN_ZOOM_OUT,
+	BTN_PICK,
+	BTN_NUM
+};
+
+enum ButtonStatus {
+	BTN_STAT_NONE = 0,
+	BTN_STAT_DOWN,
+	BTN_STAT_UP,
+	BTN_STAT_KEEP
+};
+
+void ctrl_init();
+void ctrl_release();
+void ctrl_update();
+
+void ctrl_set_screen_size(int w,int h);
+void ctrl_get_cursor_position(int &cursorX,int &cursorY);
+
+ButtonStatus ctrl_button_pressed(ButtonID btnId);
+
+#endif /* __CTRL_FUNC_H__ */