Change avatar to use Compound implementation (#11448)

* Move avatar to new compound implementation

* Make space avatars square

* Remove reference to the avatar initial CSS class

* remove references to mx_BaseAvatar_image

* Fixe test suites

* Fix accessbility violations

* Add ConfirmUserActionDialog test

* Fix tests

* Add FacePile test

* Fix items clipping in members list

* Fix user info avatar sizing

* Fix tests

src/components/structures/UserMenu.tsx

@@ -458,9 +458,7 @@ export default class UserMenu extends React.Component<IProps, IState> {
                             idName={userId}
                             name={displayName}
                             url={avatarUrl}
-                            width={avatarSize}
-                            height={avatarSize}
-                            resizeMethod="crop"
+                            size={avatarSize + "px"}
                             className="mx_UserMenu_userAvatar_BaseAvatar"
                         />
                         {liveAvatarAddon}