Moved all settings (and even the GUI objects that contain the settings.. not very OO, but very convenient..) to the appSettings class.
This class only depends on base classes from OF and various addons, not on our own classes. This means that its header can be included early, and all its functionality is available to all our objects (particles, fluids, etc). This means our artistic creation can easily be manipulated from the GUI, without having to pass variables through 3 layers of nice clean OO insulation..