delete unused files, cleanup code

bigbluebutton-html5/imports/api/audio/client/bridge/sip.js

.../imports/ui/components/audio/audio-controls/component.jsx

...ml5/imports/ui/components/audio/audio-modal/component.jsx

...orts/ui/components/audio/audio-notification/component.jsx

...orts/ui/components/audio/audio-notification/container.jsx

...mports/ui/components/audio/audio-notification/styles.scss

.../imports/ui/components/audio/audio-settings/component.jsx

...tml5/imports/ui/components/audio/audio-test/component.jsx

...tml5/imports/ui/components/audio/audio-test/container.jsx

...luebutton-html5/imports/ui/components/audio/component.jsx

...luebutton-html5/imports/ui/components/audio/container.jsx

...imports/ui/components/audio/device-selector/component.jsx

...ml5/imports/ui/components/audio/enter-audio/component.jsx

...ml5/imports/ui/components/audio/enter-audio/container.jsx

...tml5/imports/ui/components/audio/join-audio/component.jsx

...ml5/imports/ui/components/audio/mute-button/component.jsx

...ml5/imports/ui/components/audio/mute-button/container.jsx

...html5/imports/ui/components/audio/mute-button/styles.scss

...ui/components/audio/open-audio-modal-button/component.jsx

...ui/components/audio/open-audio-modal-button/container.jsx