cpal

migrate wasm example to trunk (#844) #805

Job	Run time
rustfmt-check	12s
clippy-test	1m 2s
cargo-publish	11s
ubuntu-test	44s
asmjs-wasm32-test (wasm32-unknown-emscripten)	1m 5s
linux-check-and-test-armv7	1m 58s
wasm32-bindgen-test (wasm32-unknown-unknown)	18s
wasm32-wasi-test (wasm32-wasi)	17s
android-apk-build	1m 41s
android-check	1m 50s
ios-build	2m 35s
macos-test	1m 55s
windows-test (x86_64)	4m 26s
wasm-beep-build	28s
windows-test (i686)	4m 19s
	23m 1s

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