packages: change metainfo, .desktop and image file symlinks to install commands for appstream builder

[TraceyC77]

appstream builder cannot handle symlinks, use install instead in package.yml for

• .desktop files
• image files like .png
• appdata.xml files

Update all packages using symlinks to use install instead for these

Note:
Valid paths for appstream metainfo are:
/usr/share/metainfo/org.some.package.xml
/usr/share/appdata/org.some.package.xml <- legacy, discouraged.

An example of a package that used symlinks is yubico-authenticator. This PR was made to update it (and add an appdata file)

Old:

    ln -s $YUBIOATH_DIR/linux_support/com.yubico.authenticator.desktop $installdir/usr/share/applications/com.yubico.authenticator.desktop
    ln -s $YUBIOATH_DIR/linux_support/com.yubico.yubioath.png $installdir/usr/share/pixmaps/com.yubico.yubioath.png

New:

    install -Dm00644 $installdir/$YUBIOATH_DIR/linux_support/com.yubico.authenticator.desktop $installdir/usr/share/applications/com.yubico.yubioath.desktop
    install -Dm00644 $installdir/$YUBIOATH_DIR/linux_support/com.yubico.yubioath.png $installdir/usr/share/icons/hicolor/128x128/apps/com.yubico.yubioath.png
    install -Dm00644 $pkgfiles/com.yubico.yubioath.appdata.xml -t $installdir/usr/share/metainfo/

[TraceyC77]

For reference, this is the issue for adding metainfo to all packages that have a .desktop file