Fabian Homborg 8c9359fdd4 src/builtin_argparse: Add --ignore-unknown flag ...

This keeps all unknown options in $argv, so

```fish
argparse -i a/alpha -- -a banana -o val -w
```

results in $_flag_a set to banana, and $argv set to `-o val -w`.

This allows users to use multiple argparse passes, or to simply avoid
specifying all options e.g. in completions - `systemctl` has 46 of
them, most not having any effect on the completions.

Fixes #5367.

2019-04-29 15:57:56 +02:00

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