feat: Help Heading and Display Order work in prep for deprecations #3414
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Don't want to forget this remaining work
This clarifies the intent and prepares for other functions doing the same, like `next_display_order`. This will then open us to name `subcommand_help_heading` and `display_order` similar. The deprecation is waiting on 3.1. This is part of clap-rs#1807 and clap-rs#1553.
For the derive API, you can only call `next_display_order` when dealing with a flatten. Until we offer app attributes on arguments, the user can workaround with this no-op flattens. This is a part of clap-rs#1807
In clap 4.0, we will make `DeriveDisplayOrder` the default and this is how you'll disable it. This is part of clap-rs#2808
This was referenced Feb 8, 2022
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