Adding REQUIRED and Needs, using simple name more often

[henryiii]

Changes:

• (REQUIRED) is now added for required options
• Needs is printed instead of Requires in help
• Simple name is used in more places to keep help readable

[codecov]

Codecov Report

Merging #104 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #104   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines        1418   1420    +2     
=====================================
+ Hits         1418   1420    +2

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

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