Menus does not adapt to window resizing

[Côme Chilliet]

Working on the low resolution bug made me realize that when we resize the window of the game, the menu does not adapt correctly like it should

[KIAaze]

Menus are recentered after resize now, thanks to scoobydog's commit, but the size of the text does not change, which means it is still possible to have text outside the window if it becomes too small. (tested with Irrlicht version 1.7.0)

[Côme Chilliet]

I agree, this is better but not perfect, For instance the ingame menu (when pressing ESC) can have some options outside of the window on small resolutions. The main menu adapts well its width, but the height is not adapting well.

[karjonas]

I have made a commit in my repository with a concept of how the gui could adapt. It is in a draft state currently but I want you to try it out and see if it could work for us so I wont waste my time polishing it :)