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/luaengine/declarations.h

@@ -30,6 +30,6 @@ class LuaObject;
 
 typedef std::function<int(LuaInterface*)> LuaCppFunction;
 typedef std::unique_ptr<LuaCppFunction> LuaCppFunctionPtr;
-typedef std::shared_ptr<LuaObject> LuaObjectPtr;
+typedef stdext::shared_object_ptr<LuaObject> LuaObjectPtr;
 
 #endif