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

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");
```

Use in QML:

```
    Component.onCompleted: {
      process.start("some-bin", ["some args"])
    }


    Text {
        id: output
        x: 0
        y: 0
        text: ""
    }


    Process {
        id: process
        //onReadyRead: {output.text += readAll();output.text += readAllStandardOutput();}
        onReadyReadStandardError: {output.text += readAllStandardError();}
        onFinished: {
            console.log("finished", exitCode)
            output.text += exitCode.toString()
            console.log(readAllStandardError());
        }
        onErrorOccurred: {
            console.log("error!");
            output.text += readAllStandardError()
        }
    }
```