Ensure terminate signal is handled in main thread #301

Job	Run time
build-linux (gcc-9)	5m 28s
build-linux-Qt6 (gcc-9)	7m 7s
build-macos-brew (clang-9)	2m 53s
build-macos-brew-Qt6 (clang-9)	4m 1s
build-macos-no-brew (clang-9)	5m 45s
build-macos-no-brew-Qt6 (clang-9)	7m 1s
build-windows-mingw (5.15.*)	15m 11s
build-windows-mingw-Qt6 (6.5.*, qtmultimedia qt5compat)	17m 59s
build-windows-vs (5.15.*)	11m 59s
build-windows-vs-Qt6 (6.3.*, qtmultimedia qt5compat)	18m 45s
	1h 36m 9s

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