add __declspec(dllexport) to class

[xiaoyifang]

fixes #780
related to #741

[codecov]

Codecov Report

Patch coverage: 87.50% and no project coverage change.

Comparison is base (6210433) 56.07% compared to head (1b9f748) 56.07%.

❗ Current head 1b9f748 differs from pull request most recent head 841ffdf. Consider uploading reports for the commit 841ffdf to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #783   +/-   ##
=======================================
  Coverage   56.07%   56.07%           
=======================================
  Files          98       98           
  Lines        4394     4394           
  Branches     1910     1910           
=======================================
  Hits         2464     2464           
  Misses        672      672           
  Partials     1258     1258           

Impacted Files	Coverage Δ
include/zim/archive.h	94.82% <ø> (ø)
include/zim/blob.h	72.72% <ø> (ø)
include/zim/entry.h	100.00% <ø> (ø)
include/zim/error.h	71.42% <ø> (ø)
include/zim/writer/item.h	33.33% <ø> (ø)
include/zim/search.h	50.00% <50.00%> (ø)
include/zim/search_iterator.h	100.00% <100.00%> (ø)
include/zim/suggestion.h	100.00% <100.00%> (ø)
include/zim/suggestion_iterator.h	87.50% <100.00%> (ø)
include/zim/writer/contentProvider.h	53.84% <100.00%> (ø)
... and 1 more

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[xiaoyifang]

@mgautierfr can you approve this to run the checks

[kelson42]

Small comment about the naming: I would prefer DECLSPEC in place of ZIM_LIB, only my opinion.

[xiaoyifang]

done

[kelson42]

@veloman-yunkan Are we good to merge?

[veloman-yunkan]

Last small change and we can merge