Allows per output xml and cc files #299

Job	Run time
build-linux-Qt6 (gcc-9)	6m 31s
build-linux (gcc-9)	5m 49s
build-macos-brew-Qt6 (clang-9)	4m 4s
build-macos-brew (clang-9)	3m 10s
build-macos-no-brew (clang-9)	6m 8s
build-macos-no-brew-Qt6 (clang-9)	7m 2s
build-windows-mingw (5.15.*)	15m 15s
build-windows-mingw-Qt6 (6.5.*, qtmultimedia qt5compat)	17m 57s
build-windows-vs (5.15.*)	11m 28s
build-windows-vs-Qt6 (6.3.*, qtmultimedia qt5compat)	18m 13s
	1h 35m 37s

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