Provide a method for changing the capture fps for desktop tracks during the call. These changes to the lib are needed for making it configurable from the UI.

When the resolution option was being used, all the other constraints like frameRate and facing mode were being overwritten.

SDP utility classes are spread across RTC and XMPP directories now, moving these class files to a 'sdp' directory.

Fixes https://github.com/jitsi/lib-jitsi-meet/issues/1571.

Disable simulcast for low fps screenshare and enable it for high fps screenshare. testing.capScreenshareBitrate config.js setting has now been deprecated.

* fix: high CPU on Chrome with low fps screen sharing

It turns out that if 5 fps is set on the track constraints,
Chrome will capture the original video in 30 fps and only
further down the pipeline will downsample it to 5 fps.
This results in very high CPU usage. Specify max FPS in
getDisplayMedia to fix the problem.

Getting rid of track.applyConstraints should also fix another
issue on Firefox where it reports 0x0 screen size after this call.

* ref(RTCUtils): remove trackOptions

* remove extra &&

Stop using the legacy pc constraints that are no longer wired up to WebRTC.

Apple added getUserMedia support for WkWebview based browsers like chrome and Firefox on iOS 14.3. These browsers behave as Safari does on iOS. Therefore, extend the Safari checks to these webkit based browsers as well.

RTCUtils.enumerateDevices was being called earlier than the RTCUtils.init which assigned that function

Fire PERMISSION_PROMPT_IS_SHOWN when none of the devices have a label
Fire a new SLOW_GET_USER_MEDIA event if the timeout for getUserMedia is exceeded

Update JitsiMeetJS.createLocalTracks to include the options for firing the above events
in the provided options argument. Deprecate the firePermissionPromptIsShownEvent flag in
method's signature

It has been `true` for a very long time.

Cleanup some unused code after the bump.

The old stream needs to be released while keeping the tracks intact

Device IDs can change without triggering any event. In order to sync the
device IDs that  we store with the actual device IDs, we need to update
them every time when we call enumerate devices.

This error happens in getCurrentlyAvailableMediaDevices

* fix(safari): override min/max video constraints on safari
Override the constraints on Safari because of the following webkit bug.
https://bugs.webkit.org/show_bug.cgi?id=210932
Camera doesn't start on older macOS versions if min/max constraints are specified.

Standard audio constraints need to be passed to gUM for audio input device selection
to work properly on Safari.
Safari doesn't support permissions query, add a workaround for that.

MediaStreamTrack getConstraints on Safari returns an empty object.
Enable device selection on Safari.

Enabled desktop sharing and discontinue support for Safari versions prior to 12.1, i.e., the ones with no VP8 support

Some devies may not be able to satisfy it and gUM will fail. Tested with a
crappy old camera which can only do VGA resolution at 4/3 aspect ratio.

Overconstrainederror occurs when calling gum with "exact"
when on URLs with a hash. To get around this, remove
"exact". Add handling for specified device not being
found, as we can no longer rely on "exact". This
still leaves open the possibility of the wrong
camera being accessed.

We had several reports that googSuspendBelowMinBitrate misbehaves, we had been running for a while with that disabled for the bridge, but it was causing problems and for p2p.

React Native also supports it now.

If it's good enough for Google Meet it's good enough for us :-)

* Removes Edge support.

* Removes unused dependency.

* fix(permissions): remove space from requesting camera

Chrome errors on querying permissions with "camera "
because it does not match an expected enum.

* fix(permissions): check value of returned PermissionStatus

A permissions query returns an object with a status/status
of whether or not permission has been granted. Check that
value in addition to the existence of the object.

* fix(permissions): prevent permission being set to undefined

* ref(permissions): move permissions strings to constants

Spot is the consumer of screensharing using a camera
input and through a proxy connection. To differentiate
which one is active, declare a source type on the
created "desktop" stream.