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Use blur node to render shadow blur

Georges Basile Stavracas Neto requested to merge feaneron/gnome-shell:gbsneto/gpu-shadow-blur into master

It is generally faster than downloading the texture, blurring with the CPU, and uploading the blurred texture. Notice that 'n_values' is calculated differently from the blur_pixels() function; that's because it needs to match Clutter's blur shader interpretation of sigma [1].

[1] https://gitlab.gnome.org/GNOME/mutter/-/blob/master/clutter/clutter/clutter-blur.c#L89

Edited by Georges Basile Stavracas Neto

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