UACWindowFocusHelper thread properly set as background thread. #110

Job	Run time
build / Build	3m 20s
build / Test	5m 28s
Build Installer & Draft Release	2m 50s
Publish Release	2s
Push to Chocolatey & Winget	2m 23s
docs / deploy	1m 9s
Push to Nuget	0s
	15m 12s

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