cpal

Remove parking_lot dependency (#846) #804

Job	Run time
cargo-publish	36s
rustfmt-check	10s
clippy-test	1m 4s
asmjs-wasm32-test (wasm32-unknown-emscripten)	53s
linux-check-and-test-armv7	1m 49s
ubuntu-test	39s
wasm32-wasi-test (wasm32-wasi)	24s
android-apk-build	1m 27s
android-check	1m 22s
macos-test	2m 13s
wasm32-bindgen-test (wasm32-unknown-unknown)	19s
windows-test (x86_64)	3m 52s
ios-build	3m 15s
windows-test (i686)	3m 33s
wasm-beep-build	43s
	22m 19s

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