[Beta] update libwebrtc without iosrtc custom patch to ~M54

[hthetiot]

1. This PR is a work in progress.
2. Test it at your own risk.
3. It as been confirmed to fix iOS 13 support.

Testing

To test task/libwebrtc-update branch

cordova plugin remove cordova-plugin-iosrtc --verbose
cordova plugin add https://github.com/cordova-rtc/cordova-plugin-iosrtc#task/libwebrtc-update --verbose
cordova platform remove ios --no-save
cordova platform add ios --no-save

TODO

• Update webrtclib

• Restore rtcDTMFSender

• add turnOnSpeaker

• add requestPermission

• add MediaStreamRenderer.prototype.save to take MediaStream capture

• Fix MediaStreamRenderer visible

Notes:

I will released M54 on 5.1.0 once rtcDTMFSender is completed and migrate on M69 as part of 6.0.x. See milestones Roadmap for details:

• https://github.com/cordova-rtc/cordova-plugin-iosrtc/milestones

[hthetiot]

Work in progress status on real device

[hthetiot]

Thank you @SejH

[hthetiot]

Note: Until rtcDTMFSender is ready JsSip may be not fully supported by this branch.

[hthetiot]

Path to m69 here https://github.com/PeterXu/cordova-plugin-iosrtc/commits/master

[hthetiot]

I will released M54 on 5.1.0 once rtcDTMFSender completed and migrate on M69 as part of 6.0.x.
See milestones Roadmap for details:

• https://github.com/cordova-rtc/cordova-plugin-iosrtc/milestones

[hthetiot]

rtcDTMFSender need iosrtc patch workarround, cause i dont want to patch cause i dont want to rebuild M54 since I'm on M69 PR see #399

If someone is willing to provide a patched build i will merge in that PR but i doubt anyone will help.

[hthetiot]

Note: This PR will not going to be released. Everything works like 5.0.4 except rtcDTMFSender (see 23789a3)

Instead this one will be released instead #399 using M69 on version 6.0.0 instead ~M54

This PR was mainly used to understand the scope of the migration from previous webrtclib versions see comment #385 (comment).

[hthetiot]

Closed in favor of #399 that will be released for version 6.0.0

[hthetiot]

For some unknown reason DTLS was not initialized in that branch making it possiblity insecure I think.
https://github.com/cordova-rtc/cordova-plugin-iosrtc/blob/task/libwebrtc-update/src/iosrtcPlugin.swift#L40

I confirmed master is initializing DTLS and that #399 also does.