Fixes #15430.

* added hover styles and added tabIndex to the container instead of the meeting heading

* lint error fix

* Added heart reaction feature

* Edits to preserve alphabetical sorting

* Changed the position of hide self view checkbox

* undid irrelevant changes made

* Fixed CSS issue + tooltip text

Signed-off-by: Joshua Irmer <irmer@gonicus.de>

 - Move the styles from css to tss-react ones
 - Dynamic fontSize based on the visible area of the page
 - Remove the gaps in the background when a line is wrapped.
 - Change the text color to white.
 - Remove transparency.

* fix(chat): fixed error message colors

* fix(chat): changed error message background color

feat(accessibility): add validation warning on room name

* Convert all vh units to dvh; fixing layout for mobile browsers such as Chrome for Android.

Remove unused styles

Remove some unused variables
Replace variables that are only used once with their value

feat(a11y): Globally improve accessibility for screen reader users

Revert color change of scroll corner

Move styles from SCSS to JSS
Convert components from class to function

Move some styles from SCSS to JSS
Remove unnecessary styles
Remove feedback stars animation option

Move styles from SCSS to JSS
Convert a component from class to function

Move styles from SCSS to JSS
Convert class to function component

Move ListItem to base/ui

Update Dial Out Dialog design
Update Country Picker design
Convert some files to TS
Move styles from SCSS to JSS
Replace atlaskit InlineDialog with Popover in CountryPIcker and Prejoin components

Create Tooltip component
Fix Popover positioning calculations
Add margins to popover
Remove @atlaskit/tooltip
Update all components to use the new Tooltip component

Added tooltip actions and reducers for the following functionality: when a user hovers over an element is sees the tooltip for that element and then hovers another element that has a tooltip, instead of using the delay and animations we just unmount the current tooltip and mount the next one immediately

- small refactor

Use our component instead of atlaskit
Implement redesign
Add unmount animation
Change mount animation from external lib to CSS
Remove @atlaskit/flag
Remove react-transition-group
Add unmount animation on native
Remove AbstractNotification

Convert file to TS
Move styles from SCSS to JSS

feat(a11y): use tabs ARIA design pattern when using tabbed UI

Create separate tabs for Audio and Video in the Settings Dialog
Move some settings from the More tab to Audio/ Video tab
Implement redesign
Convert some files to TS
Move some styles from SCSS to JSS
Enable device selection on welcome page

feat(a11y): fix-focus-styles

- redesign deeplinking mobile page, desktop page and dial in number page
- now dial in number page is an entry point in app.bundle.