Toger5/bigbluebutton

[toger5]

This adds a BigBlueButton call option to element web.

Requirements:

• enable feature flag: feature_big_blue_button_calls
• add configuration for:

 big_blue_button?: {
        // should look like this: "https://some-bbb-domain.com/widget?device_id=$org.matrix.msc3819.matrix_device_id&room_id=$matrix_room_id&display_name=$matrix_display_name&baseUrl=$org.matrix.msc4039.matrix_base_url&userId=$matrix_user_id",
        widget_url: string;
    };

• https://some-bbb-domain.com has to point to a hosted BigBlueButton widget: https://github.com/toger5/bbb-matrix-widget

Try it out:

For more details checkout the related BigBlueButton Issue with a more indepth description of the project and the required setup.
Signed-off-by: Timo K toger5@hotmail.de

Checklist

• Tests written for new code (and old code if feasible).
• New or updated public/exported symbols have accurate TSDoc documentation.
• Linter and other CI checks pass.
• Sign-off given on the changes (see CONTRIBUTING.md).

Open Todos:

• Auto approve the widget capabilities for the configured widget.

[toger5]

Also adds/fixes/changes

• no chat button shown for maximised widgets
• jitis shown was shown in top container -> now shown in center container
• minimizing widget did not hide the the right panel chat
• rename maximized -> maximised