improve network targets

[goatshriek]

Makes improvements focused on network targets, including:

WSAStartup and WSACleanup are now only called the first time needed and upon stumpless_free_all, respectively, instead of once for each network target opened/closed.

TCP network targets using the sys/socket.h implementation will detect a FIN message before a send and fail immediately. Before this change, the closure of the stream was not caught noticed and message sends would return with a success code despite not having being received by the remote end. TCP network targets using the Winsock implementation still exhibit the later (broken) behavior.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (latest@8f3d535). Click here to learn what that means.

Additional details and impacted files

@@            Coverage Diff            @@
##             latest     #404   +/-   ##
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  Coverage          ?   90.54%           
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  Files             ?       46           
  Lines             ?     4188           
  Branches          ?      556           
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  Hits              ?     3792           
  Misses            ?      273           
  Partials          ?      123           

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud