[DAEMON-81] winreglib: Implement native addon to watch Windows Registry keys

On Windows, the daemon needs to watch the Windows Registry for Android SDK, JDK, and Visual Studio related keys so that the system info can monitor it. In the daemon prototype, the detect engine would use https://www.npmjs.com/package/winreg (which calls reg.exe) and polls the Windows Registry every 15 seconds. This is inefficient and slow. It would be better if we had a native C++ addon for Node that we could use. It looks like it would need to call RegNotifyChangeKeyValue() (https://msdn.microsoft.com/en-us/library/windows/desktop/ms724892(v=vs.85).aspx). The C++ code would expose a simple API where you can start and stop watching a specific key. Then we need a high-level .js API that exports a nicer, efficient ES6 compliant API. I imagine the RegistryWatcher would extend an EventEmitter. This file would also make use of https://www.npmjs.com/package/node-pre-gyp-init to try and downloading the pre-built binary.

API

The public API will expose 3 methods: get, list, and watch. get() will retrieve the value for a given key. list() will retrieve all subkeys and values for a given key. watch() will start watching a registry key for changes. It will return a watch handle that emits change events and also contains the stop() method to unwatch.

import { get, list, watch } from 'winreglib';

const value = get('HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run');
console.log(value = ${value});

const { resolvedRoot, key, subkeys, values } = list('HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run');
console.log(resolvedRoot = ${resolvedRoot});
console.log(key = ${key});
console.log('subkeys:', subkeys);
console.log('values:', values);

const handle = watch('HKCU'\\Software\\Microsoft\\Windows\\CurrentVersion\\Run');
handle.on('change', evt => {
    console.log('change!', evt);

    handle.stop();
});