move getCollisionBox from ActiveObject to interface class Collidableobject

src/collidableobject.h

@@ -0,0 +1,36 @@
+/*
+Minetest-c55
+Copyright (C) 2012 sapier
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program 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
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+#ifndef __COLLIDABLEOBJECT_H__
+#define __COLLIDABLEOBJECT_H__
+
+#include <irrlichttypes.h>
+
+class CollidableObject {
+public:
+	virtual aabb3f* getCollisionBox() = 0;
+
+	inline float getFlexibility() { return m_Flexibility; }
+	inline int   getWeight()      { return m_Weight; }
+protected:
+	int m_Weight;
+	float m_Flexibility;
+	aabb3f m_collisionbox;
+};
+
+#endif //__COLLIDABLEOBJECT_H__