cpal

Allow creation of OutputCallbackInfo and InputCallbackInfo objects (for test purposes) #863

Job	Run time
ubuntu-test	34s
clippy-test	55s
android-check	40s
android-apk-build	1m 26s
asmjs-wasm32-test (wasm32-unknown-emscripten)	56s
cargo-publish	0s
linux-check-and-test-armv7	1m 50s
macos-test	58s
rustfmt-check	2s
wasm32-bindgen-test (wasm32-unknown-unknown)	18s
wasm32-wasi-test (wasm32-wasi)	15s
windows-test (x86_64)	5m 20s
windows-test (i686)	4m 45s
ios-build	2m 53s
wasm-beep-build	31s
	21m 23s

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