cpal

migrate wasm example to trunk #798

Job	Run time
cargo-publish	0s
android-check	37s
asmjs-wasm32-test (asmjs-unknown-emscripten)	28s
android-apk-build	1m 35s
asmjs-wasm32-test (wasm32-unknown-emscripten)	44s
clippy-test	1m 7s
ios-build	5m 10s
linux-check-and-test-armv7	1m 40s
macos-test	2m 29s
rustfmt-check	10s
wasm32-bindgen-test (wasm32-unknown-unknown)	16s
wasm32-wasi-test (wasm32-wasi)	15s
ubuntu-test	29s
wasm-beep-build	27s
windows-test (x86_64)	4m 43s
windows-test (i686)	4m 42s
	24m 52s

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