Daniel van Vugt 85f173d0d7 clutter: Pass 'radius' to public blur APIs instead of 'sigma'
Although they're in the same units, `radius` is easier to understand than
`sigma` and makes the public API independent of the blur algorithm used
behind the scenes. We now only keep the `sigma` terminology where the
implementation is Gaussian-specific.

The assumption that `sigma = radius / 2.0` is actually not new here. We
just move it from `_st_create_shadow_pipeline` (gnome-shell!1905) into
`clutter_blur_new`.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1908>
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