Reload the whole app when package.json changed

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When you edit package.json, it should trigger a reload of the whole app. (Maybe optionally.) Previously it closed and reopened the window, but that stopped working, probably at [email protected]. With chrome.runtime.reload() we should be able to do something even better: reload the whole app! Some things like chromium-args probably require relaunching the entire process, but there are some snippets of code people have written in https://github.com/nwjs/nw.js/issues/149 to do just that, at least for some platforms.