Major update -- UI and code improvements, new features

Merge pull request #718 from opentok/ECO-5904

[ECO-5904] List of archives not properly updated when archive state changes

Merge pull request #644 from opentok/develop

Add security related http headers

Merge pull request #642 from opentok/dependabot/npm_and_yarn/http-pro…

…xy-1.18.1

Bump http-proxy from 1.17.0 to 1.18.1

Merge pull request #641 from opentok/develop

merge to master

Merge Develop into Master for production release (#603)

* Keep state of user name

* Fixing some sec. vulnerabilities

* Rollback karma-coverage version

* Update README.md

* Update example.json

* Cursor loses focus in the Chat window after messages are sent

* Fix Send Message focus on button click

* Update README.md

* Update example.json

* Update README.md

* Update README.md

* Update README.md

* Update example.json

Removed Firebase placeholder text and disabled optional Archiving feature by default. 
Flipped Screensharing to True as it's 'free' without the extension.

* Bump websocket-extensions from 0.1.1 to 0.1.4

Bumps [websocket-extensions](https://github.com/faye/websocket-extensions-node) from 0.1.1 to 0.1.4.
- [Release notes](https://github.com/faye/websocket-extensions-node/releases)
- [Changelog](https://github.com/faye/websocket-extensions-node/blob/master/CHANGELOG.md)
- [Commits](faye/websocket-extensions-node@0.1.1...0.1.4)

Signed-off-by: dependabot[bot] <support@github.com>

* [ECO-5245] Remove oldVersionCompat server method (#630)

* Remove oldVersionCompat server method

* Bump version

Co-authored-by: Emiliano Pelliccioni <emilianop11@gmail.com>
Co-authored-by: marina serrano montes <marinas@tokbox.com>
Co-authored-by: Marina Serrano Montes <mserranomontes@MacBook-Pro-de-Marina-2.local>
Co-authored-by: Jeff Swartz <jeff.swartz@vonage.com>
Co-authored-by: Lawrence Hayes <lhayes@tokbox.com>
Co-authored-by: Lawrence Hayes <lawrence.hayes@vonage.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Germán Goldenstein <german.goldenstein@gmail.com>

Merge pull request #504 from opentok/develop

Merge to Master for production deployment

Merge pull request #502 from opentok/develop

This release contains:
- Changes to allow users to toggle cameras from within the app instead of through the browser
- Selecting a microphone from within the app instead of through the browser
- Design changes to make client endpoints work more reliably from within China
- Ability to send feedback to a configurable URL
- Ability to run the precall test with a different key/secret pair

Make the target for Feedback configurable

Make the target for Feedback configurable