Bugfix/73/whitelist variant attributes to copy #82
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Whitelist attributes to copy across from main enum variants to discriminant enum variants.
Currently the whitelist is:
"doc", "cfg", "allow", "deny"
.Fixes #73
A potential extension (not implemented, but would fix #41) is to allow a
#[strum_discriminant(..)
attribute on each variant, and pass through everything within the..
, flattening away thestrum_discriminant
layer, and making sure to override any of the whitelisted attributes if present.