N-api (node-addon-api) - #161

```
../src/object_async/hello_async.cpp:137:1: error: 'object_async::HelloObjectAsync::name_' should be initialized in the member initialization list [-Werror=effc++]
 HelloObjectAsync::HelloObjectAsync(Napi::CallbackInfo const& info)
```

changes. Lines starting

…e async.

This reverts commit 4df69fc.

+ formatting + use `override final`

…able

…g::data with const_cast (clang-tidy)

…explicitely transfer ownership to keep clang-tidy happy (cppcoreguidelines-owning-memory)

This reverts commit eaa4fbf.

This reverts commit bd6bdb6.

…and default `OnOk()` and `OnError`.

… (e.g clang++ differs from GCC) + check `result_` before deref etc.

C++ standard 5.2.2.8 :
"The order of evaluation of arguments is unspecified. All side effects of argument expression evaluations take effect before the function is entered. The order of evaluation of the postfix expression and the argument expression list is unspecified."

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1905.pdf