support 17[xml]

[bbbgan]

XML is supported in C++17, and its performance remains almost the same as before.

[bbbgan]

from left to right, it is: current repository, C++20 of PR , C++17 of PR.

[codecov-commenter]

Codecov Report

Patch coverage: 68.18% and project coverage change: +0.11% 🎉

Comparison is base (f0d77cf) 43.58% compared to head (fb6baba) 43.70%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #207      +/-   ##
==========================================
+ Coverage   43.58%   43.70%   +0.11%     
==========================================
  Files          45       45              
  Lines        5337     5343       +6     
==========================================
+ Hits         2326     2335       +9     
+ Misses       3011     3008       -3     

Files Changed	Coverage Δ
iguana/json_util.hpp	20.00% <ø> (ø)
iguana/xml_reader.hpp	33.33% <0.00%> (ø)
iguana/xml_util.hpp	46.15% <0.00%> (+4.97%)	⬆️
iguana/xml_writer.hpp	91.66% <0.00%> (-2.46%)	⬇️
test/test_xml.cpp	100.00% <100.00%> (ø)

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