Various improvements & fixups for linux installation #1552
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Various fixups to conform more closely with modern linux install standards.
Provide appstream metainfo so the application is displayed in various linux software centres e.g. gnome-software, discover, cosmic-store.
Install the .png and .svg icons to standard linux locations as previously gnome-software would not display the icon for the application.
Don't hardcode locations in .desktop file, as the assets are installed to standard paths there is no reason to now.
Feel free to expand the metainfo as needed with any additional fields specified here: https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html