eth IDE milestone 1

UI written in QML.
Feature : constant compilation.
Either
```
MixApplication::MixApplication(int _argc, char *_argv[]): QApplication(_argc, _argv)
```
or
```
MixApplication::MixApplication(int _argc, char *_argv[]):
    QApplication(_argc, _argv)
```

first is preferred for brevity, but second is acceptable.