Adding size instead of expected + unchangable

[henryiii]

Working on #87.

• Move to using two values instead of one for expected: expected and type_size. Drop unchangable, which was really just a hack for not knowing the type size.
• Expand policies to support multiple options
• Check/expand support for expected -N where N>1.
• Check/fix help printout for typeval > 1. Add test. (@AbcAeffchen)

[codecov]

Codecov Report

Merging #92 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #92   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines        1399   1409   +10     
=====================================
+ Hits         1399   1409   +10

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

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[henryiii]

@AbcAeffchen, can you check and see if printout works (and patch if it doesn't), and maybe add a test to help test that checks for your expected printout? Any tests you can think of are appreciated, really. :)

Otherwise, I think this is about ready.

[henryiii]

Going to go ahead and merge, feel free to add a test/fixes for your use case and PR!