Confirmation shown when you erase all highscores
Modified `--help` and `--version` a bit
Layout changes - added 1 width for the main menu and a blank between some options
Made `MenuItemNumberbox` get drawn with [] and <> just like `MenuItemTextlist`
Made `MenuItemCheckbox` get drawn with <> if highlighted
Made the window help text a little different
Bumped to v3.0.0