Started implementing the user interface
+ Created a MainWindow, and created a layout for it
+ Created a MandelDisplay Control that takes care of displaying a mandelbrot image
+ The Mandelbrot class now also reports for which parameters the results where calculated, along with the actual results
* Improved the way of passing the mandelbrot area to the Mandelbrot class

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
The area in the mandelbrot image can now be set using the MainWindow
+ When recalculating the mandelbrot image, the parameters in the spinners in the MainWindow are now passed
+ Clicking the mandelbrot image now makes it zoom in on the location
+ The mandelbrot image can be dragged
+ A message is displayed when a new mandelbrot image is being calculated