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Add tests for empty positional and for positional defaults

Implement breadth-first positional parsing. Enable positional Option.Default. Expose argument.Parsed

Utilize two-stage parsing with positionals subsequent to flags

Add tests for parse ordering issues

Add TestPos8

Augment tests to cover new functions better

Refactor code so that Options.Positional is now private field set in new arg functions

Add examples and info to the README

Remove incorrect comment

Fail command.addArg for disallowed positional types

Unit tests and minor changes

Initial prototype of positional arguments

Update README.md

Update FUNDING.yml