fix: Allow the root node to define `Help()` (#593)

feat: signature defaults

Thanks to @cmilesdev for the first pass in #579!

feat: expose ValueFormatter option through HelpOptions for custom Hel…

…pPrinters (#563)

fix: don't require a Run() method on dynamic commands

Commands can be dispatched via string, so this is not necessary to constitute a command.

Update license of levenshtein method (#539)

chore: optionally allow parsing of hyphen-prefixied flag parameters

This allows for eg. `foo --number -10`, `foo --flag -bar`.

Fixes #478, #315.

feat: Allow configuring global hooks via Kong's functional options (#511

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Lets you pass `kong.WithBeforeApply` along with a function that supports dynamic bindings to register a `BeforeApply` hook without tying it directly to a node in the schema.

Co-authored-by: Sutina Wipawiwat <swipawiwat@squareup.com>

refactor: ParseError can carry an exit code

Reinstated use of ParseError for all error paths so as to retain existing semantics.

chore: add test for decoding

Load environment variables as a resolver (#480)