Method smart_ptr

include/daScript/misc/smart_ptr.h:118–120

        using element_type = T;
        using element_type_ptr = T *;
        smart_ptr ( smart_ptr_jit * p ) {
            init((T *)p);
        }
        explicit operator smart_ptr_jit * () {
            addRef();   // this is only during jit wrapping. we cast to this. old one gets deleted. we need to add ref.
            return (smart_ptr_jit *)ptr;