[varLib] Add designspace lib key for custom feavar feature tag #2080
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Add designspace lib key to specify a custom feature tag for feature variations, as discussed in #2079
This looks for the custom tag when "processing = last". Alternatively it could override the value for "processing" altogether.
I used
com.github.fonttools.varLib.featureVarsFeatureTag
for the lib key, as it's reallyvarLib
that's defining it.