feat: Add terminating_positional to clap.ParseOptions
#137
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This option makes `clap.parse` and `clap.parseEx` stop parsing after encountering a certain positional index. Setting `terminating_positional` to 0 will make them stop parsing after the 0th positional has been added to `positionals` (aka after parsing 1 positional)
Hejsil
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This option makes
clap.parseandclap.parseExstop parsing after encountering a certain positional index. Settingterminating_positionalto 0 will make them stop parsing after the 0th positional has been added topositionals(aka after parsing 1 positional)This is a revival of #93 and is also a step towards subcommands (#90)