Config

[henryiii]

This reworks Formatters and adds Config.

General changes:

• Help flags now use new short_circuit property to simplify parsing

Changes to Formatters:

• Uses shared pointer instead of functional, can be accessed from App
• Added get_formatter()
• make_help is used instead of operator()
• FormatterBase is the minimum required
• FormatterLambda provides for the easy addition of an arbitrary function

New for Config:

• Overridable, bidirectional Config
• ConfigINI provided and used by default
• Renamed ini to config in many places
• Has config_formatter() and get_config_formatter()
• Dropped prefix argument from config_to_str
• Added ConfigItem

Closes #125.

[codecov]

Codecov Report

Merging #121 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #121   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          11     12    +1     
  Lines        1646   1669   +23     
=====================================
+ Hits         1646   1669   +23

Impacted Files	Coverage Δ
include/CLI/Formatter.hpp	100% <100%> (ø)	⬆️
include/CLI/Config.hpp	100% <100%> (ø)
include/CLI/ConfigFwd.hpp	100% <100%> (ø)
include/CLI/Error.hpp	100% <100%> (ø)	⬆️
include/CLI/Option.hpp	100% <100%> (ø)	⬆️
include/CLI/FormatterFwd.hpp	100% <100%> (ø)	⬆️
include/CLI/App.hpp	100% <100%> (ø)	⬆️

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