add outlines for high contrast themes (windows)

bigbluebutton-html5/imports/ui/components/app/styles.scss

bigbluebutton-html5/imports/ui/components/button/styles.scss

...html5/imports/ui/components/chat/message-form/styles.scss

...omponents/chat/message-list/message-list-item/styles.scss

...ton-html5/imports/ui/components/dropdown/list/styles.scss

...uebutton-html5/imports/ui/components/dropdown/styles.scss

...button-html5/imports/ui/components/modal/base/styles.scss

...-html5/imports/ui/components/modal/fullscreen/styles.scss

...tton-html5/imports/ui/components/modal/simple/styles.scss

...s/ui/components/nav-bar/recording-indicator/component.jsx

...rts/ui/components/nav-bar/recording-indicator/styles.scss

bigbluebutton-html5/imports/ui/components/poll/styles.scss

...omponents/presentation/presentation-toolbar/component.jsx

.../components/presentation/presentation-toolbar/styles.scss

...html5/imports/ui/components/settings/submenus/styles.scss

...utton-html5/imports/ui/components/user-avatar/styles.scss

...components/user-list/chat-list-item/chat-icon/styles.scss

...mports/ui/components/user-list/chat-list-item/styles.scss

...ebutton-html5/imports/ui/components/user-list/styles.scss

...nts/user-list/user-list-content/breakout-room/styles.scss