Better help-all, prints more info, better spacing

[henryiii]

This fixes issues found in #161 related to printing out subcommands.

• Printing help-all on nested command now fixed (App)
• Missing space after help-all restored (Default formatter)
• More detail printed on help all (Default formatter)
• Help-all subcommands get indented with inner blank lines removed (Default formatter)
• detail::find_and_replace added to utilities

An example of output now:

$ ./examples/nested camera --help-all

Configure the app camera
Usage: ./examples/nested camera [OPTIONS] [SUBCOMMAND]

Options:
  -h,--help                   Print this help message and exit
  --help-all                  Expand all help

Subcommands:
mvcamera
  MatrixVision Camera Configuration
  Options:
    -c,--config FILE=mvcamera_config.json
                                Config filename

mock
  Mock Camera Configuration
  Options:
    -p,--path PATH REQUIRED     Path

[codecov]

Codecov Report

Merging #163 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #163   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          12     12           
  Lines        1691   1699    +8     
=====================================
+ Hits         1691   1699    +8

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

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