Adjusted multi-user for 2.1

.../api/annotations/server/handlers/whiteboardAnnotations.js

...imports/api/annotations/server/methods/clearWhiteboard.js

.../imports/api/annotations/server/methods/sendAnnotation.js

.../imports/api/annotations/server/methods/undoAnnotation.js

bigbluebutton-html5/imports/api/common/server/helpers.js

.../imports/api/cursor/server/methods/publishCursorUpdate.js

...imports/api/whiteboard-multi-user/server/eventHandlers.js

...oard-multi-user/server/handlers/modifyWhiteboardAccess.js

...ard-multi-user/server/modifiers/modifyWhiteboardAccess.js

...on-html5/imports/ui/components/presentation/component.jsx

...on-html5/imports/ui/components/presentation/container.jsx

...resentation/cursor/cursor-wrapper-container/container.jsx

...s/presentation/cursor/cursor-wrapper-container/service.js

...omponents/presentation/presentation-overlay/component.jsx

...utton-html5/imports/ui/components/presentation/service.js

...ui/components/whiteboard/annotation-factory/component.jsx

...oard/annotation-factory/reactive-annotation/component.jsx

...oard/annotation-factory/reactive-annotation/container.jsx

...eboard/annotation-factory/static-annotation/component.jsx

...s/ui/components/whiteboard/annotation-group/component.jsx