For the most part the changes are taking the "static propTypes" declaration off
of components and declaring them as Flow types. Sometimes to support flow some
method signatures had to be added. There are some exceptions in which more had
to be done to tame the beast:
- AbstractVideoTrack: put in additional truthy checks for videoTrack.
- Video: add truthy checks for the _videoElement ref.
- shouldRenderVideoTrack function: Some component could pass null for the
  videoTrack argument and Flow wanted that called out explicitly.
- DisplayName: Add a truthy check for the input ref before acting on it.
- NumbersList: Move array checks inline for Flow to comprehend array methods
  could be called. Add type checks in the Object.entries loop as the value is
  assumed to be a mixed type by Flow.
- AbstractToolbarButton: add additional truthy check for passed in type.

It doesn't seem to work properly.

That is only required if we'd want our backend to authenticate on behalf of our
users. If the app is to authenticate directly it's not needed.

* Disable buttons only when token features is enabled. Fixes #3355.

* squash: update disabled check.

* squash: update disabled and disabledByFeatures.

* Refactor calendar-sync feature to be loaded on web.

For the web part it just adds new property to enable/disable calendar web integration, disabled by default.

* Initial implementation of retrieving google calendar events.

* Initial implementation of retrieving microsoft calendar events.

* Fixes comments.

* Rework to use the promise part of microsoft-graph-client api.

* Moves dispatching some actions, fixing comments.

* Makes sure we do not initializeClient google-api client multiple times.

* Do not try to login when fetching calendar entries.

The case where there is a calendar type google selected, but not logged in, trying to login on loading welcome page will show a warning that it tried to open a popup, which was denied by browser.

* Updates profile display data on sign in.

* Propagate google-api state to calendar-sync only if we use google cal.

* Adds sign out action.

* Clears the event listener when the popup closes.

* Clears calendarIntegrationInstance on signOut.

* WIP: UI for calendar settings, refactor auth flows

* Clean up some unused constants, functions and exports.

* break circular dependency of function and constant

* Exports only isCalendarEnabled from functions.

* Checks isSignedIn when doing fetchCalendarEntries on web.

* address comments

List microsoftApiApplicationClientID in undocument config.

remove unused SET_CALENDAR_TYPE action

use helper for calendar enabled in bootstrap

reorder actions

reorder imports

change order of signin -> set type -> update profile

add logging for signout error

reword setting dialog desc to avoid redundancy

add jsdoc to microsoft button props

reorder calendar constants

move default state to reducer (not reused anywhere)

update comment about calendar-sync due to removal of getCalendarState

update comment for getCalendarIntegration

remove vague comment

alpha order reducer, return default state on reset

alpha order persistence registry

remove unnecessary getType from apis

update comments in microsoftCalendar

alpha order google-api exports, use api.get in loadGoogleAPI

set jsdoc for google signin props

alpha order googleapi methods

fix calendartab docs

* Moves fetching calendar from APP_WILL_MOUNT to SET_CONFIG.

The web part needs configuration in order to refresh tokens (Microsoft).

* Fixes storing token expire time and refreshing tokens in Microsoft impl.

* Address comments

updateProfile changed to getCurrentEmail

rename result to results

stop storing integration in redux, store if ready for use

use existing helpers to parse redirect url

* update jsdocs, get google app id from redux

* clear integration instead of actual sign out

* Moves google-api in its own feature.

* Stores the profile email in redux.

* feat(recording): frontend logic can support live streaming and recording

Instead of either live streaming or recording, now both can live together. The
changes to facilitate such include the following:
- Killing the state storing in Recording.js. Instead state is stored in the lib
  and updated in redux for labels to display the necessary state updates.
- Creating a new container, Labels, for recording labels. Previously labels were
  manually created and positioned. The container can create a reasonable number
  of labels and only the container itself needs to be positioned with CSS. The
  VideoQualityLabel has been shoved into the container as well because it moves
  along with the recording labels.
- The action for updating recording state has been modified to enable updating
  an array of recording sessions to support having multiple sessions.
- Confirmation dialogs for stopping and starting a file recording session have
  been created, as they previously were jquery modals opened by Recording.js.
- Toolbox.web displays live streaming and recording buttons based on
  configuration instead of recording availability.
- VideoQualityLabel and RecordingLabel have been simplified to remove any
  positioning logic, as the Labels container handles such.
- Previous recording state update logic has been moved into the RecordingLabel
  component. Each RecordingLabel is in charge of displaying state for a
  recording session. The display UX has been left alone.
- Sipgw availability is no longer broadcast so remove logic depending on its
  state. Some moving around of code was necessary to get around linting errors
  about the existing code being too deeply nested (even though I didn't touch
  it).

* work around lib-jitsi-meet circular dependency issues

* refactor labels to use html base

* pass in translation keys to video quality label

* add video quality classnames for torture tests

* break up, rearrange recorder session update listener

* add comment about disabling startup resize animation

* rename session to sessionData

* chore(deps): update to latest lib for recording changes

* feat(recording): show the YouTube live stream URL

- From the start live stream dialog, push up the broadcast ID
  of the chosen broadcast. It is assumed the ID can be used to
  create the YouTube link.
- Listen for lib-jitsi-meet to emit updates of the known live
  stream URL, shove it into redux, and have InfoDialog display
  it.

* ref(info): pass in dial in and live stream url

Passing these values in should trigger AtlasKit InlineDialog
to re-render and reposition itself.

* ref(info): use conference existence as trigger for autoshowing dialog

* feat(info): add live stream link to invite copy

* Revert "ref(info): use conference existence as trigger for autoshowing dialog"

This reverts commit 1072102267.

* hidden -> url

* _onClickHiddenURL -> _onClickURLText

* fix(recording): fetch events also for available broadcasts

Only "persistent" broadcasts were being fetched using the
YouTube API. Fetching "all" will get persistent broadcasts
and events. If events use a custom encoder then the stream
key can be obtained. If google hangouts is used for the event
then a stream key will not be obtainable; in those cases
input empty string as the stream key.

* squash: fix typos, reword comments, use object for preventing duplicate broadcasts

* feat(recording): use google api to get stream key

* squash: renaming pass

* squash: return full load promise

* sqush: use google api state enum

* squash: workaround for lib not loading

* another new design...

* increase timeout workaround for gapi load issue

* styling pass

* tweak copy

* squash: auto select first broadcast