Interpolate anchors when instantiating smart components #1885
+266
−26
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Smart components can have anchors that vary across their internal axis space. Previously, these anchors were dropped during instantiation. Now we interpolate anchor positions using the same variation model as shape interpolation.
This fixes Murecho and other fonts that use smart components with anchors.
Fixes #1884
Equivalent fix to @khaledhosny's googlefonts/glyphsLib#1131