icons: start completing the main Symbolic icons SVG file.
It's not finished yet, but I have already added all the individual Freedesktop and GTK+ icons. The goal will be to have all the Symbolic icons in this one file so that in the future we can just extract individual SVG files from object IDs. This was the original plan but librsvg was just too buggy and would not extract the proper viewbox for some icons. Fortunately it seems that the bug reports I made are finally starting to be taken into account so I am hoping for a usable librsvg soon and starts the work which should have been done from the start.
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