feat(mangen): clap/env is itself a feature of mangen #3729
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This adds
env
as a feature toclap_mangen
and enables it by default to keep the default behaviour. I wish there was a way to make it automatically enable the feature if it detects the used library/binary usesclap/env
, though I'm unsure of how to exactly do that. I found this StackOverflow post, though it would be somewhat non-trivial and I would appreciate some input.Fixes #3355.