3 small additions (Win32 and generic)#359

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esohns wants to merge 3 commits intoOneLoneCoder:masterfrom

esohns:3_small_edits

Commits on Jan 3, 2024

- add #include <shellapi.h>; required to compile on my Win32 system
esohns
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added some brackets for precedence disambiguation (not sure if this is required)
esohns
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cast result back to T (see v2d_generic::mag()).
esohns
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