cpal

migrate wasm example to trunk #799

Job	Run time
clippy-test	43s
android-check	36s
cargo-publish	0s
linux-check-and-test-armv7	1m 39s
asmjs-wasm32-test (asmjs-unknown-emscripten)	27s
asmjs-wasm32-test (wasm32-unknown-emscripten)	42s
macos-test	2m 4s
rustfmt-check	5s
ubuntu-test	31s
wasm32-bindgen-test (wasm32-unknown-unknown)	24s
wasm32-wasi-test (wasm32-wasi)	14s
windows-test (x86_64)	5m 8s
windows-test (i686)	2m 36s
android-apk-build	1m 40s
ios-build	2m 58s
wasm-beep-build	30s
	20m 17s

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