Explicitly install qoffscreen.dll in windows installer

d.kilicrequested to merge
283-make-sure-that-the-offscreen-plugin-is-also-included-in-windows-installer into master

Example installer: https://fz-juelich.sciebo.de/s/X5L0c2hFoqMwMe7

Closes #283 (closed)

Edited by d.kilic

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