Stocqt application example re-design and implementation

Bring stocqt application example to this day by redesigning the visuals from scratch and making it use QtGraphs for visualizing the graphs themselves. The application example is to be designed and implemented with mobile use in mind.

It has to read the stock data live, not use static data stored on disk.

Static data storage will be used as a backup for situations where internet access is not available or fails.