Add "don't autoload last-used settings" preference to command bar

Necessary for its use on the Resize dialog
Added command bar to Resize dialog

What I love about this is you can store resize presets for whatever
image sizes you frequently use - a "wallpaper" preset, for example, with
your choice of stretch options so any image can be resized as a
wallpaper without distortion!

Very excited about this, as I don't know of any other photo editor that
provides "resize preset" options, despite them being immensely useful.