support parse yaml with comment and support THROW_UNKNOWN_KEY

[bbbgan]

1. support THROW_UNKNOWN_KEY

• Allow users to skip unnecessary objects

2. full support yaml with comment

• Before this, the comment after value could not be parsed correctly

[codecov-commenter]

Codecov Report

Patch coverage: 38.46% and project coverage change: +0.01 🎉

Comparison is base (66da579) 46.10% compared to head (50c4651) 46.12%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #178      +/-   ##
==========================================
+ Coverage   46.10%   46.12%   +0.01%     
==========================================
  Files          41       42       +1     
  Lines        5897     5906       +9     
==========================================
+ Hits         2719     2724       +5     
- Misses       3178     3182       +4     

Impacted Files	Coverage Δ
iguana/yaml_reader.hpp	100.00% <ø> (ø)
iguana/yaml_util.hpp	0.00% <0.00%> (ø)
test/test_yaml.cpp	100.00% <ø> (ø)
test/test_yaml_nothrow.cpp	100.00% <100.00%> (ø)

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[qicosmos]

LGTM