* Move scalable icon install from `${prefix}/share/pixmaps` (`pixmaps` has been
deprecated long time ago) to `${prefix}/share/icons/hicolor/scalable/apps`
* Add `Keywords`, `Categories`, and `MimeType` keys to `.desktop` file
* Add shared MIME-info on [`application/x-compressed-iso`](https://en.wikipedia.org/wiki/.CSO "Compressed ISO") MIME type
