Up until now we relied on implicit loading of middlewares and reducers, through
having imports in each feature's index.js.

This leads to many complex import cycles which result in (sometimes) hard to fix
bugs in addition to (often) breaking mobile because a web-only feature gets
imported on mobile too, thanks to the implicit loading.

This PR changes that to make the process explicit. Both middlewares and reducers
are imported in a single place, the app entrypoint. They have been divided into
3 categories: any, web and native, which represent each of the platforms
  respectively.

Ideally no feature should have an index.js exporting actions, action types and
components, but that's a larger ordeal, so this is just the first step in
getting there. In order to both set example and avoid large cycles the app
feature has been refactored to not have an idex.js itself.

We were only using a couple of utility functionss to parse tokens, not to
validate them in any way.

* Uses correct scopes for google API based on config.js values.

* Lower the number of parameters that we pass around.

* Fixes googleAPIState state checking.

React Native doesn't define __filename nor __dirname so do it artisanally. In
addition, this helps with centralizing the configuration passed to loggers.

Checking if the calendar support in the reducer is not only useless but wrong,
since we don't have access to the entire store (the calendar support is checked
in the base/config feature). If calendar support is not enabled the actions
being reduced won't be dispatched anyway, so no harm is done by removing the
check.

This legacy code was added about a year ago to ease the migration between
releases:
631f51d627

I consider this not to be needed anymore.

🔥🔥🔥

Using anything non-serializable for action types is discouraged:
https://redux.js.org/faq/actions#actions

In fact, this is the Flow definition for dispatching actions:

declare export type DispatchAPI<A> = (action: A) => A;
declare export type Dispatch<A: { type: $Subtype<string> }> = DispatchAPI<A>;

Note how the `type` field is defined as a subtype of string, which Symbol isn’t.

* Removes unused ADD_PEOPLE_APP_NAME
* Moves deep-link header background and logo size as variables.
* Fixes more numbers page space in the header.
* Fixes left padding on deep-linking mobile page.

* feat(welcome-page): Redesign.

* Style adjustments.

* Adds dial in default number and pin to the text for calendar/share.

* Handles fail to fetch numbers or conference id.

Since they are a language feature, they make the source code more easily
comprehensible than `if (typeof XXX === 'undefined') { XXX = ...; }`.

* Add joing button to the calendar events.

* Add space between calendar lines.

* Adjust recent list name.

* Fixes test failure.

* Restyle mobile recent list message.

* Add analytics events.

* Addressing PR review comments.

* Welcome page calendar ui improvements

* Addressing PR review comments.

Calendar integration ui

* Implements calendar entries edit.

Share text generation between calendar-sync and the share-room feature.

* Fixing comments.

* Clone the event element we modify on update.

* 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

BaseApp does all the heavy-lifting related to creating the redux store,
navigation, and so on.

App currently handles URL props and actually triggering navigation based on
them.

This commit adds a state getter that considers checking the enabled/disabled state of the calendar feature, so then other features don’t have to do it manually.

Knowledge is power, man!

We moved "knownDomains" from calendar-sync to base/known-domains.
However, we do have an official release in the app stores and I'd like
us to not throw away the knowledge it has acquired.