Adding new parse layout

[henryiii]

This hopefully will fix several recent issues by properly restructuring how parsing works inside subcommands. Each action is called recursively on subcommands, rather than during an "overall" parse. This way, each phase is complete before the next starts.

Count with no arguments now works like subcommands, and is an int. Listing a subcommand twice should increment the count twice, in theory, and could be used to call the subcommand recursive parts in order.

Todo:

• Add tests for new behavior (Issue authors are welcome to suggest tests)
• Add a few unit tests for the new count feature, at least.
• Possibly look at using parsed subcommands to do subparses in order (later, and maybe for options too)

Issues this may resolve: #176, #168 (better fix). It does not directly fix #173, but might be a step in the right direction.

[codecov]

Codecov Report

Merging #178 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #178   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          12     12           
  Lines        1726   1744   +18     
=====================================
+ Hits         1726   1744   +18

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

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