Huge engine change, replace all std::shared_ptrs

Create a new shared pointer type stdext::shared_object_ptr and stdext::shared_obj
using boost::intrusive_ptr

Advantages:
 * half memory usage
 * faster and lightweight

Disadvantages:
 * using weak_ptr is not supported anymore
 * compiling seems slower

src/framework/ui/uianchorlayout.h

@@ -74,7 +74,7 @@ public:
     void addWidget(const UIWidgetPtr& widget);
     void removeWidget(const UIWidgetPtr& widget);
 
-    UIAnchorLayoutPtr asUIAnchorLayout() { return std::static_pointer_cast<UIAnchorLayout>(shared_from_this()); }
+    bool isUIAnchorLayout() { return true; }
 
 protected:
     bool internalUpdate();