Upgrade VideoJS to 8.0 or latest stable version

[Dananji]

Description

Video.js version in Ramp has been pinned to 7.* because it needed Video.js to be that version to use the quality selector plugin used in Ramp.
Ramp was waiting on silvermine/videojs-quality-selector#93 to be merged and released to upgrade Video.js. Now that it has been merged and released @silvermine/videojs-quality-selector can be upgraded from 1.2.4 to 1.3.1 which is the latest version of the plugin. And subsequently Video.js can be upgraded from 7.* to 8.*

Done Looks Like

• @silvermine/videojs-quality-selector upgraded to 1.3.1
• videoj.js upgraded to latest stable 8.* version
• VideoJSFileDownload component's code changes to use extends instead of videojs.extend(..
• Test all the custom VideoJS components (Progressbar, previous/next buttons, current time display, trackscrubber, file download) works as expected in all supported browsers and devices
• Test all the other customization Ramp has implemented on top of native VideoJS functionalities work as expected in all supported browsers and devices

[joncameron]

This can be worked on after 7.7 release; will require a retest across media player test cases since this will be a large change.

[joncameron]

Most of the work here will be testing; custom components should all be tested for functionality.

[joncameron]

Wait to merge for a new Ramp until 3.0.1 release.

[Dananji]

This work has been deployed to Ramp demo site

[joncameron]

Need to update test cases in Testomat.io to make sure all of the areas mentioned in this ticket are represented.