* feat(a11y) buttons can now have toggled-aware a11y labels

Update title bar button: ParticipantsCountLabel -> SpeakerStatsLabel. Only show button when speaker stats is enabled
Add badge to the participants pane button to show participants count

Remove unused icons
Remove fill none from icons
Rename some icons

- add possibility to allow execution of the button's routine besides triggering
`toolbarButtonClicked` API event
- keep backwards compatibility
- get rid of `ToolbarButton`

Created Reusable components for:
- ListItem - used by participants list and lobby participants list
- ContextMenu - used by participant context menu and advanced moderation context menu
- Quick action button - used by quick action buttons on participant list items

Moved participants custom theme to base/components/themes

Created reusable button component for all participants pane buttons (Invite, Mute All, More)

Moved web components to web folder

Moved all styles from Styled Components to JSS

Fixed accessibility labels for some buttons

Removed unused code

Updated all styles to use theme tokens

* feat(toolbox) allow any toolbox button to be displayed as main

fixes the previous behaviour where only a certain set of buttons were whitelisted for being displayed in the main toolbar

* code review

* code review - fix avatar icon position