feat(device-errors): move device error dialogs to notifications

- Create a notification component for displaying a toggle.
- Create an action for showing the component if allowed by
  the local storage setting and for saving the setting to
  local storage.
- Remove all notifications having a timeout by default so the
  device error notification must be dismissed manually.
- Split the camera and mic error dialog into two separate
  notifications.

modules/UI/util/MessageHandler.js

@@ -455,7 +455,7 @@ var messageHandler = {
      * @param optional configurations for the notification (e.g. timeout)
      */
     participantNotification: function(displayName, displayNameKey, cls,
-                    messageKey, messageArguments, timeout) {
+                    messageKey, messageArguments, timeout = 2500) {
         // If we're in ringing state we skip all notifications.
         if (!notificationsEnabled || APP.UI.isOverlayVisible()) {
             return;