Improve random point generation to work with float and not integer.
#include ctime to compile on Windows.
Remove useless font declarations and #include QApplication since MainWindow will not #include QtGui nor QtWidgets.
#include QMainWindow instead of QtWidgets or QtGui since it's kindda overkill and not compatible between Qt4 and Qt5.
Window resolution is now set to 900x900.
Fractal generation is now working! computation are done in [-1,1] and then rescale to fit 900x900 screen.