Fast forwarding to class fields

use std::move for forward std::string (and other big [not fundamental] types)
```c++
constructor(std::string string)
: field(std::move(string))
```

Start by locating the code that emits C++ constructors and inspect how parameters such as std::string are initialized into class fields. Update the generated constructor output so eligible non-fundamental values use std::move, then verify the generated C++ for the affected cases.

Written by the indexing model from the issue text.