* 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
Add a "kind" param for StyledCheckbox, allowing designers to choose different styles of checkbox as needed. In addition to the preexisting default kind (now called Solid), there's an Outline kind with a green checkmark and a transparent fill. This is used in the device trust view, since the default checkbox style looks too much like the green "verified" shield and it's awkward to have those next to each other.
* Improve visibility of font size chooser
* Move slider dot sizes into variables
* Use a standard font size instead of percentage in Slider
* Use shorthand for padding in FontScalingPanel
* Change Slider text pos to px to be consistent when font changes
* Cleaner dot size for Slider selection
