add a function to get the remaining arguments in a valid order

[phlptp]

See issue #264

This adds function remaining_for_passthrough() --> different name suggestions are welcome!

It also adds some overloads with rvalue references so parse can take the function directly when used in a cascade fashion, and not do extra work or generate warnings when used. The parse from string and (argc, argv) also use this overload since the args can't be used any further.

[phlptp]

TODO:

• Documentation
• check coverage
• add Example

[codecov]

Codecov Report

Merging #265 into master will decrease coverage by 0.28%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master     #265      +/-   ##
==========================================
- Coverage     100%   99.71%   -0.29%     
==========================================
  Files          12       12              
  Lines        2737     2775      +38     
==========================================
+ Hits         2737     2767      +30     
- Misses          0        8       +8

Impacted Files	Coverage Δ
include/CLI/App.hpp	99.35% <80%> (-0.65%)	⬇️

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[codecov]

Codecov Report

Merging #265 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #265   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          12     12           
  Lines        2737   2767   +30     
=====================================
+ Hits         2737   2767   +30

Impacted Files	Coverage Δ
include/CLI/App.hpp	100% <100%> (ø)	⬆️

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[phlptp]

This also fixed a potential bug if the main app had a name and a subcommand terminator was used.

[henryiii]

Ready for review?

[phlptp]

yes

[henryiii]

I think the name is okay, it's at least easy to find if one looks for it. I would be tempted to suggest some sort of templating on the parse function, but this is better for something like the worked planned for #194 .

[phlptp]

I thought about making it a template, I also thought about making the parse take a const ref to a vector but then forcing the one that doesn't modify becomes a little more awkward. So I wasn't entirely clear what the best method of dealing with this was. In any case the main reason was so you could call parse(app.remaining_for_passthough()) without the compiler getting mad at you.