* feat(audio-only): be able to lock a browser into capturing audio only

* squash: try to make string more clear about audio only support

* squash: final strings

* fix(remote-mute): Moves remote participant mute to react

* fix(translation): Removes unused strings

* [squash] Addressing comments

fix(analytics): use string concatenation for ie11

With the introduction of wide and narrow layouts the margins of the
Filmstrip and the Toolbox became inconsistent. For example, the
Filmstrip's top in the wide layout was nearer to the top than the
secondary Toolbar.

Now that we no longer hide the filmstrip it is fine to return null
instead of trying to hide with some tricks.

Adds the ability to detect app area's aspect ratio on react-native
through the features/base/aspect-ratio.

Makes conference, filmstrip and toolbox react to the aspect ratio
changes and display filmstrip on the shorter side of the screen.

The minimum resolution needed to show the HD label should be
720, not 1080. However, the requested video quality for
high quality should be 1080.

* ref(notifications): convert some dialogs to error or warning notifications

- Expand the configurability of the Notification component so warnings
  and errors can be displayed.
- Allow Notification to take in arbitrary text for the body.
- Rename defaultTitleKey to titleKey for consistency with descriptionKey.

* ref(notifications): remove openReportDialog method

openReportDialog is a wrapper around showError that adds
a logger statement. It is being called in one place only
so remove the method and have that one place call logger.

* ref(notifications): UI.showTrackNotWorkingDialog takes a boolean

Change UI.showTrackNotWorkingDialog so it takes a boolean
arguments instead of the entire track. A small refactor so
the method needs to know less.

* [squash] Fixes eslint errors

* WiP: Fixes desktop sharing error strings and adds support button

* [squash] Fix icons appearances

* [squash] Fix translate titles and messages

* [squash] fix(translation): Fixes incorrect password string

* [squash] fix(recording): Fixes recording message

* [squash] fix(warning): Turns some warnings to errors and makes support link optional.

* [squash] fix(translation): Addressing language comments

* [squash] Fixes jsdoc and formatting

* [squash] fix(noopener): Fixes window.open noopener

* [squash] fix(constants): Extract constants and refactor NotificationWithToggle

* [squash] fix(lang): Fixes camera and mic error titles

* [squash] fix(supportLink): Renames addSupportLink to hideErrorSupportLink

Instead of targetting a div that contains multiple elements
and risking the elements appearing out of order, create a
specific div for local video to append to.

Removes hasRemoteVideoMenu from RemoteVideo.
In some cases where mod_muc_allowners is enabled we do not see the remote video menu. The problem was in the order of initialization of remote video component.
RemoteVideo#constructor -> Remotevideo#addaddRemoteVideoContainer -> Remotevideo#addRemoteVideoMenu  -> RemoteVideo#hasRemoteVideoMenu = true
Then in VideoLayout#showModeratorIndicator -> !remoteVideo.hasRemoteVideoMenu -> remoteVideo.addRemoteVideoMenu().

* [iOS] use display: 'none' to hide elements

No, it still doesn't work properly on some Android devices, sigh.

Update to react 16 react-native 49

The root view was not adjusting it's bounds after device rotation.

The intention of the code is (1) to return target if none of the setters lead
to an actual change, (2) to not modify target, and (3) to do it with a 1
copyOnWrite at most.

The intention was to override 'this' argument of 'Error.toString'.

The lib will accept new style constraints and use those
to capture audio/video. By defining the constraints in
config, there is greater flexibility for defining
and changing constraints.

The popovers in filmstrip only are displaying thinly.
As a quick workaround, set a width on them. There
should only be one anyway, which shows up when
talking while muted.

Firefox flex behaves differently from chrome. In firefox, flex
is not allowing the local video and invite button to exceed
the height of the parent, causing the local video to display
shorter than expected due to the invite button. Flex doesn't
need to be applied for local video in horizontal filmstrip
mode as it's only needed in vertical filmstrip mode to
flip the position of the invite button from above the local
video to below. Honestly, this could be better off done
declaratively in the html, but that's not as straigtforward
in this jquery+react world.

The bottom alignment of the local video container is adjusted
in horizontal filmstrip mode so that the videos remain evenly
aligned at the top but the invite button sticks out. With
the invite button hidden in filmstrip only, this only caused
misalignment. Re-adjust the local video container back down
and put transitions on the filmstrip wrapper itself, instead
of on the thumbnail wrapper level to avoid transitions
when re-adjusting.

All toolbar buttons (which have the class .button) got wrapped
in additional elements due to atlaskit tooltips. This changed
parent/child relationships within the html hierarchy, and the
filmstrip only toolbar selectors needed updating.

It seems to me that npm 5 starting adding github: as the protocol of
dependencies in package.json which are from GitHub. I personally don't
know which npm version supports these and whether we care about such a
support. Anyway, having some use github: and most not is not consistent.

By default impromptu uses the first state as the default one to show.

This reverts commit 7e831117b6.