* Allow `Hidden` options. * Throw `OptionAlreadyAdded` errors for matching subcommands or options, with ignore-case included, tests * `->ignore_case()` added to subcommands, options, and `add_set_ignore_case`. Subcommands inherit setting from parent App on creation. * Subcommands now can be "chained", that is, left over arguments can now include subcommands that then get parsed. Subcommands are now a list (`get_subcommands`). Added `got_subcommand(App_or_name)` to check for subcommands. * Added `.allow_extras()` to disable error on failure. Parse returns a vector of leftover options. Renamed error to `ExtrasError`, and now triggers on extra options too. * Added `require_subcommand` to `App`, to simplify forcing subcommands. Do **not** do `add_subcommand()->require_subcommand`, since that is the subcommand, not the master `App`. * Added printout of ini file text given parsed options, skips flags. * Support for quotes and spaces in ini files * Fixes to allow support for Windows (added Appveyor) (Uses `-`, not `/` syntax)
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