* Make useEventEmitterState more efficient
By not invoking the initializing function on every render
* Make useWidgets more efficient
By not calling WidgetStore on every render
* Add new group call experience Labs flag
* Add viewingCall field to RoomViewStore state
Currently has no effect, but in the future this will signal to RoomView to show the call or call lobby.
* Add element_call.use_exclusively config flag
As documented in element-web, this will tell the app to use Element Call exclusively for calls, disabling Jitsi and legacy 1:1 calls.
* Make placeCall return a promise
So that the UI can know when placeCall completes
* Update start call buttons to new group call designs
Since RoomView doesn't do anything with viewingCall yet, these buttons won't have any effect when starting native group calls, but the logic is at least all there and ready to be hooked up.
* Allow calls to be detected if the new group call experience is enabled
* Test the RoomHeader changes
* Iterate code
* Spike AXE A11Y testing in Cypress
* Fix NewRoomIntro breaking html/aria list rules
* Fix HeaderButtons breaking aria role semantics rules
* missing type
* Switch left panel from aside to nav and include space panel
* Give the page a main heading of the room name when viewing a room
* Use header landmark on RoomHeader
* Improve aria attributes on composer when autocomplete is closed
* Fix aria-owns on RoomHeader
* Give Spinner an aria role
* Give server picker help button an aria label
* Improve auth aria attributes and semantics
* Improve heading semantics in use case selection screen
* Fix autocomplete attribute to be valid
* Fix heading semantics on login page
* Improve Cypress axe testing
* Add axe tests
* Stop synapse after the timeline tests
* Await spinners to fade before percy snapshotting timeline tests
* Improve naming of plugin
* Update snapshots
* Fix accidental heading change
* Fix double synapse stoppage
* Fix Cypress timeline avatar assertions to be DPI agnostic
* Fix aria attributes on date separators
* delint
* Update snapshots
* Revert style change
* Skip redundant call
