Use parameter object types from C++ side

It's common to use parameter objects in C++ libraries.

```c++
struct Options {
  std::string a;
  uint64_t b;
  int32_t *c;
  // ...
}

int foo(const Options& options);
```

The parameter objects are usually trivially-relocatable struct types.
How to use them in Rust side without repeating their defintions?

+ construction and destruction
+ field access
+ passing to C++ functions 