Custom menu entries - change only icon/name/author/version

[ThatFinnDev]

When editing a menu entry JSON file to add a custom icon via "custom_icon_path", you need to specify "custom_name", "custom_author" or "custom_version" as well, for the custom icon to be applied. Also, when you're not using all arguments (custom_name", "custom_author", "custom_version" and "custom_icon_path"), the info will all be ???.