Inspired by http://www.xargs.com/qml/process.html

## Setup

Add to project.pro:

```
HEADERS += \
        ../../qml-process/process.h
```

Add to main.cpp

```c++
#include <QtQml>
#include "../../qml-process/process.h"

// in main:
qmlRegisterType<Process>("Process", 1, 0, "Process");
```

also, add the `SimpleProcess.qml` and `SimpleProcess.js` files to your
project.

The simplest way to use it is to call the `callProcess` function:

```js
import "SimpleProcess.js" as SimpleProcess

Item {
     Component.onCompleted {
           SimpleProcess.callProcess("echo", ["Hello",  "World"], (_, stdout)=>console.log(stdout))
     }
}
```