user gesture interaction (autoplay policy)

# Bug Report
user gesture interaction (autoplay policy)
## Problem
The main electron documentation states that `autoplayPolicy` defaults to `no-user-gesture-required` which unfortunately isn't the case (see [here and search for autoplay](https://electronjs.org/docs/all) ).
Actively setting it to `"autoplayPolicy":"no-user-gesture-required"` in the `webPreferences`has no effect either.

Fortunately this can be overcome by a hack described below.

### What is expected to happen?
Sound is playing without a user interaction.

### What does actually happen?
Sound is only playing with a user interaction.

## Information

I wanted to document both problem and workaround in this issue.

The workaround is based on [this part of the docs](https://cordova.apache.org/docs/en/latest/guide/platforms/electron/index.html#customizing-the-electron's-main-process) and [this issue](https://github.com/electron/electron/issues/13525#issuecomment-410923391):
Add

app.commandLine.appendSwitch('autoplay-policy', 'no-user-gesture-required');`

after

('const { app, BrowserWindow } = require('electron');')

around line 23 of `platforms/electron/platform_www/cdv-electron-main.js`.

This effectively adds a command line switch to Chromium.

### Command or Code

Take the default cordova application, add the `cordova-plugin-media`and put this code in the `onDeviceReady` method:
```
setTimeout(function () {
var myMedia = new Media("https://kozco.com/tech/piano2-Audacity1.2.5.mp3")
myMedia.play({ numberOfLoops: 2 })
}, 2000)
```
The sound will play, but only if you click the window within the first seconds.
If not, the console shows the infamous 'user interaction required' error.

### Environment, Platform, Device

Mac OS 10.13.6 (High Sierra)

### Version information

Cordova CLI

## Checklist

- [x] I searched for existing GitHub issues
- [x] I updated all Cordova tooling to most recent version
- [x] I included all the necessary information above

Start in platforms/electron/platform_www/cdv-electron-main.js near the Electron app setup and compare the documented autoplayPolicy behavior with the command-line workaround described in the issue. Reproduce the default Cordova app with cordova-plugin-media and verify that the provided delayed playback example works without a user interaction.

Written by the indexing model from the issue text.