The debounce method argument was being passed wrong (its supposed to be a method, not a function call), thus spewing exceptions in the console and rendering the debounce virtually ineffective

Avoid setting empty/undefined constraint

This removes the console warning about invalid constraint

Add setting for enabling/disabling microphone audio filters

As explained in #11143, disabling audio filters is desired in some scenarios.
This basically adds an option for user to disable default constraints.
When user doesn't change this value in Settings > Application, the default
value for each audio constraints is retrieved from settings.yml.
When user changes this value in Settings > Application, audio
filters (AGC, Noise Supression and Echo Cancellation) are all set to
true/false, according to the value selected in the Settings GUI.

To start it simple, we decided to not to add a different setting in the GUI for
each audio contraint. This may be added in the future, though (perhaps in a
dedicated Audio Settings tab)
This is related to #4873

Throttle user typing indicator function

Configurable annotation and cursor interval

Improve 16x9 Support

Fix stream stop for multiple webcams

Allow audio constraints to be changed in bbb-html5's settings.yml

In some scenarios, there's no need for the browser to apply such audio filters. For example, when user's microphone already does audio filtering (echo cancellation, noise supression ...).
This commit doens't change the current behavior (filters still follow browser's default config): admins need to uncomment/set these values if disabling/enabling specific filters if desired.
This is related to #4873

Video provider's service for local stream control was wrongly setting the disconnected
state when a multiple webcam user tried to stop a single cam. The `stopVideo` method
was inconsistent when called multiple times for the same `cameraId`.

Included a better testing scope for event dispatching and disconnected state handling.

Check if stream already exists before adding in list

Increase camera baseTimeout to 30 seconds (webcam share timeout workaround)

see https://github.com/bigbluebutton/bigbluebutton/issues/11099#issuecomment-753985300

video-preview: improvements to error handling (#9943) and cleanups

It seems the video-preview generic error fallback locale (to handle unexpected errors on our side which do not inherently come from gUM calls) was removed by accident. Adding it back.

Otherwise users who took long enough to accept the gUM permission prompt would fall into the workaround

Some browsers seem to (occasionally) not return the getUserMedia promise call and the
user gets stuck in this state unable to share her/his webcam.

Since enumerateDevices still works even on a gUM rejection this includes a racing
timeout that skips gUM. Configured at settings `gUMTimeout`.

Reproduced with Windows 10 Chrome 87.

The first getUserMedia was not supposed to be considered critical to the whole
video preview flow.

Scenarios where the user has multiple media sources and one of them was already
in use or had some malfunction problem were forcing a global skip at the video
preview modal even if one of them was available to be used.

Collected from https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia

use placeholder in the logger.error method return in the video-preview component. fix wrong file permission.

Add option to generate heap file and tweak metrics

https://github.com/bigbluebutton/bigbluebutton/pull/10826

Fix dangling fi

Provide shorter audio prompts for muted/unmuted