.desktop: Claim handling of many URI schemes

Will Thompson requested to merge wjt/url-scheme-handlers into master

This allows Nautilus to handle all the schemes that are mentioned in the tooltip generated by src/gtk/nautilusgtkplacesview.c.

Strictly speaking, Nautilus may not support all of these schemes, since they depend on what Gio supports, which cannot be determined until runtime. In the case where Nautilus is asked to handle a URI scheme it does not actually support, it will gracefully display an error.

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