Require that implementations of AudioCallback do not use references #21

Job	Run time
build linux pkg-config	1m 8s
build bundled (macos-latest)	5m 21s
build vcpkg (macos-latest)	9m 19s
build bundled (ubuntu-latest)	1m 56s
build vcpkg (ubuntu-latest)	4m 30s
build bundled (windows-latest)	4m 8s
build vcpkg (windows-latest)	8m 37s
build bundled (--release, macos-latest)	4m 15s
build bundled (--release, ubuntu-latest)	1m 53s
build bundled (--release, windows-latest)	6m 49s
build bundled (static-link, macos-latest)	6m 21s
build bundled (static-link, ubuntu-latest)	2m 0s
build bundled (static-link, windows-latest)	3m 55s
build bundled (static-link, --release, macos-latest)	5m 34s
build bundled (static-link, --release, ubuntu-latest)	2m 7s
build bundled (static-link, --release, windows-latest)	6m 50s
	1h 14m 43s

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