Entering PiP mode while the permissions dialog is display will not only
fail, but also mess up the Activity lifecycle on some OS versions.
We may end up with two activity/fragment instances and a situation where
the onStop callback was not called yet on the instance #1 while
the onResume has been already called on instance #2.

A libre build will exclude the following:

- Analytics modules
- Google Play services GMS
- Crashlytics
- Firebase

- don't hardcode defaults in gradle files
- allow for uploading also to HTTP URLs
- support HTTP authentication when publishing

It releases the SDK and all dependencies (including React Native) to the
specified Maven repo.

Use an ever increasing number so no manual updates are necessary.

On some Samsung devices the call done with the ConnectionService end up
in the native call history which we don't want. That's fixable by
marking the Connection as "external" just before the call is
disconnected.

Another issue specific to Samsung devices about the audio focus not
always being release when that call ends. That's fixable by marking
the call as holding just before disconnecting it.

They greatly simplify starting a JitsiMeetActivity by encapsulating the creation
of the Intent adn extras placement.

In order to make this possible JitsiMeetConferenceOptions now implements
Parcelable so it can be serialized and passed around when creating an Intent.

Now that we have both a Fragment and an Activity there are lifecycle methods
that overlap. If a Fragment requests permission by calling requestPermissions
then the result handler will be called on itself. React Native's permissions
module, however, calls ActivityCompat.requestPermissions on the Activity, thus
we need to handle the results at the Activity level and not at the Fragment
level.

It's a number whichb must be ever increasing with each build submitted to the
store.

Automate its value by using the number of seconds since 1st of January 2019.
That should be enough for ~680 years.

Turns out that on Samsung phones the calls placed with
the ConnectionService appear in the calls log as weird long numbers.
The system mangles the address we give it ("sip:meet.jit.si/something")
into this weird long number and the call to request.getAddress() returns
that. Turn off the presentation as neither this number nor our address
makes sense. This way the call appears as from "Unknown" caller in call
history which is still not perfect, but better than the random number.

Note that other phones will preserve the originally passed address value
(tested on One Plus 5).

Turns out the microphone will not work on some devices when starting in
"audio only", because the audio mode is not set to the MODE_IN_COMMUNICATION,
but to the MODE_IN_CALL. Calling setAudioModeIsVoip(true) makes
the system adjust to MODE_IN_COMMUNICATION and the mic works fine.

When running the app from Android Studio the React packager is not automatically
started. In vanilla RN projects this is done by the "react-native run-android"
command, but often times it is desired to run from Android Studio.

This fixes that by starting the packager from Gradle.

It's enabled by default, but marked as experimental (uh?!). It creates trouble
as sometimes the packager goes bananas. Disable them until further notice, our
bundle is not that large anyway.

This new version comes with an updated JSC runtime, so we no longer need to
depend on the updated version ourselves.

Consolidate all failure cases into a single one: CONFERENCE_TERMINATED. If the
conference ended gracefully no error indicator will be present, otherwise there
will be.

It renders a single JitsiMeetFragment which holds the JitsiMeetView view.

In practice, we are never going to be in a position where we don't have a
ReactContext but we do have some React Native code running. So let's not expect
the impossible.

It was never used and typicallt the Activity / Fragment holding the
JitsiMeetView object will be the listener.

In addition, once we refactor the events they will be reduced into far fewer.

Co-authored-by: Saúl Ibarra Corretgé <saghul@jitsi.org>

Add JitsiMeetFragment and refactor the app to use it.