presets pane for switching between presets

[agurvich]

BUTTONS that when you click them they apply different presets and they're labeled by the name of the file. have a defaultSettings.json setting that is just a list of preset filenames, check for existence at GUI creation and then make a button bound to applyOptions for that preset. Then you can flip between different views without having to click load preset. can also bundle presets with existing data. would be amazing for versions of Firefly where you turn off subsets of the controls but would still want to be able to change them in predefined ways