Add switch speaker

[amatakasap]

I am developing a phone call application with opentok.

I wanted to play sound from an ear speaker to make a voice call.

I tried this.

• cordova-plugin-audiotoggle
  https://github.com/danielflippance/audiotoggle
• cordova-plugin-audioroute
  https://github.com/saghul/cordova-plugin-audioroute

But it did not work as expected.

So I tried making it myself.

Reference links.
https://stackoverflow.com/questions/45424446/avaudiosession-playing-audio-through-earpiece-speaker
https://chat.stackoverflow.com/rooms/130176/room-for-mehul-sojitra-and-gaby-fitcal
https://github.com/opentok/opentok-ios-sdk-samples/tree/master/Custom-Audio-Driver/External-Audio-Device

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I wanted to add functionality with with OpenTokPlugin without using OTDefaultAudioDevice and OTDefaultAudioDeviceWithVolumeControl.

Please tell me if there is a good plan.