Improve error reporting for bad arg/group/subcommand names #3140
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This is especially helpful for people transitioning off of `is_present` being used for subcommands. Fixes clap-rs#3139
This will make it faster for someone to figure out what is going on without dropping down to `RUST_BACKTRRACE=1` by giving them the arg *and* telling them which function *they* called was involved.
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With 3.0, we panic if the user passed in a bad arg, group, or subcommand name. This makes the errors and backtraces more specific.