Support for wasm-bindgen based querying of hardwareConcurrency. #141
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Add an optional feature that allows wasm-bindgen projects to query hardwareConcurrency
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It is possible to multithread Rust in the browser by making use of Web Workers and
SharedArrayBuffer.This change adds an optional feature that can be opted into find the number of logical processors via the browsers
hardwareConcurrencyproperty: https://developer.mozilla.org/en-US/docs/Web/API/Navigator/hardwareConcurrencyThe change is careful to work both when called from the browser's main thread and when called from a Web Worker.