macOS package improvements

[mwestphal]

A few possible improvements to the macOS package suggested by @epsimatic

• App would look better if it's named just F3D.app, not F3D-2.0.0.app. It would help with upgrades, too.
• The app would look nicer with a macOS style icon. It doesn't need to be anything fancy, just your standard icon overlaid over a rounded square. There are generators online and offline that can do that.
• App could be signed to avoir the needed work around
• Menu line is notably empty, missing even the standard «App → Quit» item. If you'd add a menu bar with all the options and toggles, it won't hurt the minimal style. Menus in macOS stay in a dedicated place, leaving the window sleek and minimal.
• macOS ARM support and universal binaries : Done in Apple Silicon Binary #626
• F3D ignores Command-Q, standard system-wide quit shortcut on macOS #753
• Package libf3d SDK as a framework on MacOS #588
• Upon app launch on macOS, key press does not register until user clicks within window  #1295
• MacOS package improvements f3d-superbuild#173