Draft: Prevent crash on exit of application on Windows

Ingo Klöckerrequested to merge
work/kloecker/fix-crash-on-exit-on-windows into master

Use static storage duration for the cached color scheme config

Using thread storage duration causes a crash on Windows when Kleopatra is quit.

For details see the analysis in https://dev.gnupg.org/T5962

Edited by Ingo Klöcker

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