QML player should remember the size of the window if that is altered

Live preview (and Play) open in large screen, even on big displays. This is rather annoying and worst part is that the player does not remember the screen sizes if I modify them manually.

Tasks:

• Have a 'scale' button in the player that allows to scale the view to 1/4->4x vs. original and remember this preset.
• Use player-specific screen dimensions instead the same with the project.
• Store the parameters of the window when it is moved around and store them to the player window.