Show more information about the AppImage being opened

[azubieta]

In order to improve the UX it would be required to show more information about the AppImage being opened. The following fields will be requiered:

• Name
• Description
• Author
• Version
• Icon
• Links ()

This information can be fetched from the ".Desktop" and "appstream.xml" files.

[TheAssassin]

libappimageinfo, your new project, might come in handy for the purpose, once it's ready. I guess we should wait for you to finish the library.