The legacy M.core.event.FILTER_CONTENT_UPDATED event has been replaced with a
new core_filter/events::filterContentUpdated native DOM event.

The new event can be triggered using the `notifyFilterContentUpdated`
function, and by providing with an Array containing the HTMLElements
that were updated, for example:

```
import {notifyFilterContentUpdated} from 'core_filter/events';

const someHandler = e => {
    // ...
    const nodeList = Array.from(document.querySelectorAll('div'));
    notifyFilterContentUpdated(nodeList);
};
```

The new event can be listened to at any point in the DOM using the
following syntax:

```
import {eventTypes} from 'core_filter/events';

const handler = e => {
    // The list of HTMLElements in an Array.
    e.detail.nodes;
};

document.addEventListener(eventTypes.filterContentUpdated, handler);
```

A backward-compatabibility layer is included to ensure that any legacy
YUI event listener, or jQuery event listener are still called with the
same arguments.

This legacy bridges will be removed after Moodle 4.3.

Hotkeys were enabled by default, except fullscreen (hotkey "f").

This change includes a build to fix all minified file changes in Moodle
as a result of upgrades to our build process.

Upgrade VideoJS (7.7.6), Youtube Playback for VideoJS (2.6.1), Flash Tech for VideoJS (2.2.1), Flash Player for VideoJS (5.4.2)

Upgrade videojs media player to version 7.6.5 as well
as a general update this adds MPEG-DASH and HLS playlist
support to the Video.JS media player.

Upgrade Video.JS to 7.5.5
Upgrade videojs-youtube plugin to 2.6.0
Upgrade videojs-flash plugin to 2.2.2

Added additional AMD modules for bootstrapping the DOM
window and document objects to Video.JS in line with the
updates made to Video.JS.

If we let videojs auto-init the video/audio tags present in the page - we cannot guarantee that the
youtube library will be loaded by the time video.js is processing the tag.

Video.js uses the presence of a data-setup attibute to signal that it should auto-init this tag, so
we have to rename our config attribute to something else.

Dan Poltawski authored Jan 11, 2017 and Marina Glancy committed Jan 12, 2017

The videojs javascript is over 1MB of javascript which we don't need to
load on every page, now that we only require it demand, the js can be
lazily loaded when its needed, which keeps the first.js smaller and more
likely to stay in browser cache.