Hints for muse in main

Warnings

• asv-type-property-required
  org.musesequencer.Muse3.appdata.xml:9 - translation ()
  This tag requires a type property.
• asv-tag-empty
  org.musesequencer.Muse3.appdata.xml:9 - translation
  The mentioned tag is empty, which is highly likely not intended as it should have content.
• asv-desktop-app-launchable-missing
  org.musesequencer.Muse3.appdata.xml -
  This `desktop-application` component is missing a `desktop-id` launchable tag. This means that this application can not be launched and has no association with its desktop-entry file. It also means no icon data or category information from the desktop-entry file will be available, which will result in this application being ignored entirely.