Include Windows.h to uncover more defects on Windows.

[1uc]

The purpose is to make our CI more sensitive to name clashes of macros with tokens we've used in HighFive. The idea is that by including Windows.h we should be pulling in many standard macros. Hence we should be able to detect the defect.

[codecov]

Codecov Report

Merging #723 (aca7479) into master (add5c49) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head aca7479 differs from pull request most recent head bd4a057. Consider uploading reports for the commit bd4a057 to get more accurate results

@@            Coverage Diff             @@
##           master     #723      +/-   ##
==========================================
- Coverage   82.42%   82.39%   -0.04%     
==========================================
  Files          67       67              
  Lines        4513     4504       -9     
==========================================
- Hits         3720     3711       -9     
  Misses        793      793              

Impacted Files	Coverage Δ
include/highfive/bits/H5Converter_misc.hpp	85.84% <ø> (ø)
tests/unit/tests_high_five.hpp	100.00% <ø> (ø)
include/highfive/bits/H5DataType_misc.hpp	78.64% <100.00%> (ø)
tests/unit/tests_high_five_base.cpp	99.65% <100.00%> (-0.01%)	⬇️

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[1uc]

This requires #725 and #722 to pass.