Fixes #2762 #2237

TouchableWithoutFeedback and TouchableHighlight interfere with the
implementation of 'pinch to zoom' to come. We prepare for it by driving
the onClick/onPress handler(s) out of Conference, through LargeVideo and
ParticipantView into Video itself where the bulk of 'pinch to zoom' will
be implemented.

In preparation for "pinch to zoom" support in desktop streams on mobile, make
certain Views not intervene in touch event handling. While the modification is
necessary for "pinch to zoom" which is coming later, it really makes sense for
the modified Views to not be involved in touching because they're used to aid
layout and/or animations and are to behave to the user as if they're not there.

Update RNFetchBlob to use a commit that fixes issues with calling UI API
on a background thread. Note: The commit used is from a forked repo that
is not yet merged on the new source for this RN component, eventually we
should be consuming from this repo instead
https://github.com/joltup/react-native-fetch-blob

* fix(welcome-page): modify styling for narrow screens

* squash: fix autoscrolling on mobile safari

When combined with mod_muc_poltergeist mod_muc_call allows
for enabling call features using a proper ext_events.lib.lua
implementation. By default when the module is configured only
stub implementations are used for ext_events.lib.lua as these
are unique between deployments.

This PR takes The Bulldozer Approach (R): removes the old toolbox and lots of
associated code, though not all of it. Subsequent cleanups will follow.

Adds Nat64InfoModule which resolves IPv6 addresses for IPv4 addresses
in IPv6 only network where jitsi-meet deployment does not provide any
IPv6 addresses as ICE candidates.

* fix(info): bold info labels

* fix(info): do not truncate url

* feat(info): show only during a lonely call

* Align hint box text to center

* Fix disappearing hint box on android

Being kicked out of the conference will result with a conference failed
event with 'conference.kicked' reason and take the user back to
the welcome page by navigating to 'undefined'.

* ref(toolbar): add accessibility labels for torture tests

* squash: update propTypes

Electron generally can bypass having to get permission for
audio and video. In the case it doesn't have it, and the
permission screen is displayed, a string should still display
prompting the user to click allow. Right now the string id
displays.

This update is explicitly for FF screenshare and
gum retry fixes.

I don't understand the old showDesktopSharingButton action
but I've tried my best to copy it over. There is an existing
issue where the keyboard shortcut gets registered when it
probably shouldn't because screensharing is disabled. It will
be fixed soon with refactoring of the entire logic determining
whether or not to show the screensharing button.

This is instead of showing the button with a tooltip about it
being disabled.

The onPresence parsing was refactored to remove use of jQuery.
This exposed three methods not available in react-native:
ParentNode.children, ChildNode.remove, and
document.querySelectorAll. The querySelectorAll change could
be swapped for the already polyfilled querySelector, but
children and remove had to be added. The polyfills are based
on those supplied by MDN web docs, but modified to pass jitsi
linting.

The redux flows for video muting may not cover all cases
that the conference.js flows cover. Just exercise the old
flows to be safe.

The redux flows do not account for as many scenarios, such
as config.startWithAudioMuted being true.

* fix(toolbar): make darker for better text contrast

* squash: borrow some atlaskit colors

Reorganize calendar access request flow