Reservere --appimage-* parameter space for type 1 AppImage runtime

We have a bunch of legacy AppImages which still use type 1. I figured it might be a good idea to reserve the `--appimage-*` parameter prefix to make sure attempts to extract such an AppImage with `--appimage-extract` etc. show an error message, and won't result in calling the actually bundled app.

Example: https://bintray.com/probono/AppImages/Arduino